 battery connection screw up |
|
|
|
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG.
This site is not affiliated with Porsche in any way. Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners. |
|
|
  |
| dt4 |
 Feb 11 2020, 02:32 PM
Post
#41
|
|
Senior Member  Group: Members Posts: 503 Joined: 26-May 19 From: England Member No.: 23,161 Region Association: England 
 |
its a very slow errr......long pause...... errr .......click
(IMG:style_emoticons/default/smile.gif) I have looked the wiring over and cant see anything untoward As the fuel pump can be heard running and there is small sign of life in as much as there is power getting to the starter but either not enough to turn it over or the starter has a problem, could there be anything on the relay board that could have been effected? I notice there is a circuit board on the underside, could a track have been burnt out? (there isnt any sign to suggest this, i am just fishing for ideas) |
   |
 
|
| ejm |
Feb 11 2020, 05:28 PM
Post
#42
|
|
I can see the light at the end of the tunnel Group: Members Posts: 2,705 Joined: 3-February 03 From: Massachusetts Member No.: 224 Region Association: None |
QUOTE(dt4 @ Feb 11 2020, 03:32 PM)  could there be anything on the relay board that could have been effected? I notice there is a circuit board on the underside, could a track have been burnt out? (there isnt any sign to suggest this, i am just fishing for ideas) No. Since the solenoid engages when you turn the key to start the only circuit relevant on the relay board is good. The connections you haven't tested are where the battery cables are crimped onto the terminals at either end. These can and do corrode internally. I've used jumper cables from the battery terminals to a ground near the starter and the starter battery cable post to provide an alternate current path. If the engine spins faster you have a cable problem. If the starter was working before this issue I would look into this before pulling or replacing the starter. |
|
|
|
| ctc911ctc |
Feb 11 2020, 07:20 PM
Post
#43
|
|
Senior Member Group: Members Posts: 948 Joined: 9-June 18 From: boston Member No.: 22,206 Region Association: North East States
|
QUOTE(ejm @ Feb 11 2020, 06:28 PM) QUOTE(dt4 @ Feb 11 2020, 03:32 PM) could there be anything on the relay board that could have been effected? I notice there is a circuit board on the underside, could a track have been burnt out? (there isnt any sign to suggest this, i am just fishing for ideas) No. Since the solenoid engages when you turn the key to start the only circuit relevant on the relay board is good. The connections you haven't tested are where the battery cables are crimped onto the terminals at either end. These can and do corrode internally. I've used jumper cables from the battery terminals to a ground near the starter and the starter battery cable post to provide an alternate current path. If the engine spins faster you have a cable problem. If the starter was working before this issue I would look into this before pulling or replacing the starter. (IMG:style_emoticons/default/agree.gif) (IMG:style_emoticons/default/agree.gif) (IMG:style_emoticons/default/agree.gif) (IMG:style_emoticons/default/agree.gif) (IMG:style_emoticons/default/agree.gif) I would run the jumper cable from the negative terminal first - battery to starter - this will confirm that the chassis is working as a ground conductor or not. Next If there is no change, take the cable off completely Then the Positive side: Connect the jumper cable to the starter on the big nut, where the battery cable connects (once this is done the other end of the cable is HOT - make sure it is not touching anything), then connect to the positive - Double Check- lug of the battery. Then turn the key! If there is no change to in either test,,,,this is getting interesting! |
|
|
|
| porschetub |
Feb 11 2020, 07:36 PM
Post
#44
|
|
Advanced Member Group: Members Posts: 4,754 Joined: 25-July 15 From: New Zealand Member No.: 18,995 Region Association: None |
QUOTE(dt4 @ Feb 12 2020, 09:32 AM) its a very slow errr......long pause...... errr .......click (IMG:style_emoticons/default/smile.gif) I have looked the wiring over and cant see anything untoward As the fuel pump can be heard running and there is small sign of life in as much as there is power getting to the starter but either not enough to turn it over or the starter has a problem, could there be anything on the relay board that could have been effected? I notice there is a circuit board on the underside, could a track have been burnt out? (there isnt any sign to suggest this, i am just fishing for ideas) My advise maybe suspect as electrical work is a real art on older cars as you are always chasing issues. You could try to crank the starter manually by jumpering the hot lead to your yellow solenoid wire,try that and may prove you have an ignition switch issue which is very possible with these cars. Yes you can bench test the starter after you have done the above, (IMG:style_emoticons/default/beer.gif) |
|
|
|
| dt4 |
Feb 12 2020, 01:32 AM
Post
#45
|
|
Senior Member Group: Members Posts: 503 Joined: 26-May 19 From: England Member No.: 23,161 Region Association: England
|
I guess I can make this easier to get the jumper leads to the starter by putting the battery under the car? so not having to thread them down and around and also not as likely for the positive to contact something it shouldn't?
I am clear on which is the positive for the starter could some one show which is the negative or is it obvious once I get back under and take another look? Many thanks for the pointers chaps (IMG:style_emoticons/default/thumb3d.gif) |
|
|
|
| dt4 |
Feb 12 2020, 01:36 AM
Post
#46
|
|
Senior Member Group: Members Posts: 503 Joined: 26-May 19 From: England Member No.: 23,161 Region Association: England
|
 I took a photo from ebay, I am guessing the negative is the terminal that is not the positive (IMG:style_emoticons/default/biggrin.gif) |
|
|
|
| 914Greg |
Feb 12 2020, 03:15 AM
Post
#47
|
|
Newbie Group: Members Posts: 14 Joined: 17-November 19 From: Australia Member No.: 23,647 Region Association: None |
Technically speaking when connecting and disconnecting jumper cables the negative terminal is the last fitted and first removed and not connected to the battery post.
The reason being if there is a mistake with polarity or a dead short there is the potential for sparks, if this happens at the battery there is a possibility of an explosion caused by sparks igniting battery gases. |
|
|
|
| ctc911ctc |
Feb 12 2020, 11:04 AM
Post
#48
|
|
Senior Member Group: Members Posts: 948 Joined: 9-June 18 From: boston Member No.: 22,206 Region Association: North East States
|
QUOTE(dt4 @ Feb 12 2020, 02:36 AM)  I took a photo from ebay, I am guessing the negative is the terminal that is not the positive (IMG:style_emoticons/default/biggrin.gif) We still have some conceptual work to do. The entire car - everything metal is negative. So, the negative lead should be connected to the starter chassis or a point close to the starter. See the red circle in the picture. We are testing the connections from the neg term on the battery, through the car to the starter, there is a ground strap that connects the engine/trans to the chassis - this may be a problem. |
|
|
|
| Spoke |
Feb 12 2020, 12:36 PM
Post
#49
|
|
Jerry Group: Members Posts: 7,104 Joined: 29-October 04 From: Allentown, PA Member No.: 3,031 Region Association: None
|
QUOTE(dt4 @ Feb 12 2020, 02:36 AM) I took a photo from ebay, I am guessing the negative is the terminal that is not the positive (IMG:style_emoticons/default/biggrin.gif) The lug closest to the starter body is the positive power for the actual starter motor. The lug towards the top of the picture is the connection to the battery. The bendix (small cylinder above the starter motor) is a contactor which connects the 2 lugs together electrically to turn the starter motor. The bendix also pushes out the gear which engages the flywheel so the starter motor will turn the flywheel. The small electrical tab on the bendix is the power (from the ignition switch) to power the bendix. Personally I wouldn't try to connect any wires or jumper cables to the starter. I would inspect the wires and if anything, measure the voltage on the lug from the battery when the starter is engaged. Once you have the voltage at the starter, do the same measurement at the battery measuring from the positive terminal CLAMP and at the actual battery terminal. This will test the clamp and wire to make sure it is electrically sound. Also check the ground strap on the battery to chassis AND the ground strap on the transmission. All cables should be clean and secure. |
|
|
|
| dt4 |
Feb 12 2020, 12:40 PM
Post
#50
|
|
Senior Member Group: Members Posts: 503 Joined: 26-May 19 From: England Member No.: 23,161 Region Association: England
|
so I connected a jumper lead to the negative battery terminal and the engine and the starter sped up quite noticeably although not enough to fire up
I then ran a jump lead from the positive post on the starter to the positive to the battery, the starter remained at the increased speed but the engine didnt fire suggesting a negative lead to battery problem I also wonder about the non firing issue, could there be coil damage? I swapped batteries over but to no effect and now have the better of the 2 on charge as it started to struggle. I also tried the negative jumper on the starter itself to see if that was grounded, it ran at the improved speed but the doesnt sound to be any firing, I could take a plug out to see if there is a spark but I dont have a helper any more as the Mrs has fallen and broken her wrist |
|
|
|
| ctc911ctc |
Feb 12 2020, 03:10 PM
Post
#51
|
|
Senior Member Group: Members Posts: 948 Joined: 9-June 18 From: boston Member No.: 22,206 Region Association: North East States
|
You should not have taken your frustration out on your darling bride! Seriously, I hope she will mend quickly.
(IMG:style_emoticons/default/biggrin.gif) (IMG:style_emoticons/default/biggrin.gif) (IMG:style_emoticons/default/poke.gif) You need a 'lad' from the neighborhood to assist you - I would start by removing the grounding strap and cleaning and reattaching. As to the firing (Carb or Injectors?) check on the spark first. The coil, points and perhaps other ignition parts can be damaged. Search web on "testing Ignition coil". This is pretty easy as to Good/Bad, however, some test OK and then do not perform properly. However, to get going I would: Check the plugs for firing Check the plug wires Inspect the cap and rotor (burn marks,etc) Check the points (burn marks, etc.) Hey, you got past one mystery, how many are left to go? QUOTE(dt4 @ Feb 12 2020, 01:40 PM) so I connected a jumper lead to the negative battery terminal and the engine and the starter sped up quite noticeably although not enough to fire up I then ran a jump lead from the positive post on the starter to the positive to the battery, the starter remained at the increased speed but the engine didnt fire suggesting a negative lead to battery problem I also wonder about the non firing issue, could there be coil damage? I swapped batteries over but to no effect and now have the better of the 2 on charge as it started to struggle. I also tried the negative jumper on the starter itself to see if that was grounded, it ran at the improved speed but the doesnt sound to be any firing, I could take a plug out to see if there is a spark but I dont have a helper any more as the Mrs has fallen and broken her wrist |
|
|
|
| dt4 |
Feb 12 2020, 03:23 PM
Post
#52
|
|
Senior Member Group: Members Posts: 503 Joined: 26-May 19 From: England Member No.: 23,161 Region Association: England
|
thanks, the pointers are much appreciated
will report back (IMG:style_emoticons/default/clap56.gif) |
|
|
|
| dt4 |
Feb 13 2020, 12:21 PM
Post
#53
|
|
Senior Member Group: Members Posts: 503 Joined: 26-May 19 From: England Member No.: 23,161 Region Association: England
|
IT RUNS !!!!!!!!!!!!
It took a lot of attempts but I got the feeling that it was trying to fire just as it felt like the battery would die it fired and spluttered but with a bit of help on the throttle cable to lift the idle speed it started to run smoothly It needed the jumper cable from the negative post to the engine and it wouldnt start if using the normal negative battery lead so I will order a new lead. Its a relief to know nothing else is fried although none of the instruments are working so Ill have to check fuses etc.... thanks for all the input chaps (IMG:style_emoticons/default/thumb3d.gif) |
|
|
|
| Spoke |
Feb 13 2020, 04:00 PM
Post
#54
|
|
Jerry Group: Members Posts: 7,104 Joined: 29-October 04 From: Allentown, PA Member No.: 3,031 Region Association: None
|
Great news!
What about the alternator? Does it appear to be operating? Is the GEN light on or off? Does the GEN light come on when the key is turned w/o the engine running? |
|
|
|
| jcd914 |
Feb 13 2020, 04:07 PM
Post
#55
|
|
Advanced Member Group: Members Posts: 2,081 Joined: 7-February 08 From: Sacramento, CA Member No.: 8,684 Region Association: Northern California |
QUOTE(Spoke @ Feb 13 2020, 02:00 PM) Great news! What about the alternator? Does it appear to be operating? Is the GEN light on or off? Does the GEN light come on when the key is turned w/o the engine running? He replaced the Alternator. QUOTE(dt4 @ Feb 10 2020, 05:23 AM) so the latest... I tracked an alternator down over here and fitted it at the weekend With the ignition on I can hear the fuel pump running at the front, when I turn the key to start it is very slow to crank and is not firing, its as though the battery is virtually flat I swapped out the battery for a spare that I believe to be good but the same result. Looking for suggestions as to what else to check please I am an electrical numbskull and whilst I have a circuit tester I have no clue how to use it. |
|
|
|
| Spoke |
Feb 13 2020, 05:11 PM
Post
#56
|
|
Jerry Group: Members Posts: 7,104 Joined: 29-October 04 From: Allentown, PA Member No.: 3,031 Region Association: None
|
QUOTE(jcd914 @ Feb 13 2020, 05:07 PM) He replaced the Alternator. Thanks. Didn't read all the posts. |
|
|
|
| dt4 |
Feb 14 2020, 01:55 AM
Post
#57
|
|
Senior Member Group: Members Posts: 503 Joined: 26-May 19 From: England Member No.: 23,161 Region Association: England
|
No warning lights but that said the instruments were all dead so more to look at there
The main thing was getting it running again after the mess up I can now move it again when the weather improves and be able to clean down the garage in readiness for painting |
|
|
|
| ctc911ctc |
Feb 14 2020, 09:50 AM
Post
#58
|
|
Senior Member Group: Members Posts: 948 Joined: 9-June 18 From: boston Member No.: 22,206 Region Association: North East States
|
Do not forget to remove, clean and reinstall the ground strap - many gremlins can hide in there.
Congrats on the start! You have finished your freshman class on 914 Electrics (IMG:style_emoticons/default/cheer.gif) (IMG:style_emoticons/default/cheer.gif) (IMG:style_emoticons/default/beerchug.gif) (IMG:style_emoticons/default/beerchug.gif) QUOTE(dt4 @ Feb 14 2020, 02:55 AM) No warning lights but that said the instruments were all dead so more to look at there The main thing was getting it running again after the mess up I can now move it again when the weather improves and be able to clean down the garage in readiness for painting |
|
|
|
| dt4 |
Feb 15 2020, 01:13 PM
Post
#59
|
|
Senior Member Group: Members Posts: 503 Joined: 26-May 19 From: England Member No.: 23,161 Region Association: England
|
out of curiosity i tried the jumper lead from the battery negative to the connection bolt on the inner wing and there was clearly a poor connection as the starter struggled to turn over but it fired up pretty quickly once I earthed to the engine
The bolt and surrounding area on the inner wing are all nice and clean bright metal so thats puzzling |
|
|
|
| porschetub |
Feb 15 2020, 01:38 PM
Post
#60
|
|
Advanced Member Group: Members Posts: 4,754 Joined: 25-July 15 From: New Zealand Member No.: 18,995 Region Association: None |
QUOTE(dt4 @ Feb 14 2020, 07:21 AM) IT RUNS !!!!!!!!!!!! It took a lot of attempts but I got the feeling that it was trying to fire just as it felt like the battery would die it fired and spluttered but with a bit of help on the throttle cable to lift the idle speed it started to run smoothly It needed the jumper cable from the negative post to the engine and it wouldnt start if using the normal negative battery lead so I will order a new lead. Its a relief to know nothing else is fried although none of the instruments are working so Ill have to check fuses etc.... thanks for all the input chaps (IMG:style_emoticons/default/thumb3d.gif) Well done,pleased to hear you got it running (IMG:style_emoticons/default/beerchug.gif) . |
|
|
|
|
2 User(s) are reading this topic (2 Guests and 0 Anonymous Users)
0 Members:
|
Lo-Fi Version | Time is now: 27th December 2024 - 06:52 AM |
Invision Power Board
v9.1.4 © 2024 IPS, Inc.