Electrical Question #15 Need Help Please, I'm totally stumped this time |
|
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. |
|
Electrical Question #15 Need Help Please, I'm totally stumped this time |
76-914 |
Apr 6 2014, 06:33 PM
Post
#21
|
Repeat Offender & Resident Subaru Antagonist Group: Members Posts: 13,611 Joined: 23-January 09 From: Temecula, CA Member No.: 9,964 Region Association: Southern California |
I'm going to have several electrical questions. 1st, Is pin #8, on the 14 pin plug at the relay board, the only switched 12v+ source in the engine compartment? TIA, Kent
|
76-914 |
Aug 9 2021, 01:33 PM
Post
#22
|
Repeat Offender & Resident Subaru Antagonist Group: Members Posts: 13,611 Joined: 23-January 09 From: Temecula, CA Member No.: 9,964 Region Association: Southern California |
Jerry, With the switch pulled out - on position - I have continuity from all 3 pins to the case. With the switch pushed in - off - I have continuity between pin 31 and the case. Also, when I energized pin 31 with a 9v battery with the switch pulled out - on - I am getting 9v from pins K to the case & from pin 15 to the case. The switch lights up whenever it is pulled out, as it should.
The Wt/Bl that goes to pin 85 on the relay comes from fuse #1. Shouldn't it go to ground? Otherwise the relay has 2 - 12v sources feeding the magnet of the relay. (IMG:style_emoticons/default/confused24.gif) EDIT: Now I'm wondering if the switch must be bad since the Fog Lamps works as long as the switch isn't mounted and grounded to the panel??? |
Spoke |
Aug 10 2021, 11:34 AM
Post
#23
|
Jerry Group: Members Posts: 7,052 Joined: 29-October 04 From: Allentown, PA Member No.: 3,031 Region Association: None |
Jerry, With the switch pulled out - on position - I have continuity from all 3 pins to the case. With the switch pushed in - off - I have continuity between pin 31 and the case. Also, when I energized pin 31 with a 9v battery with the switch pulled out - on - I am getting 9v from pins K to the case & from pin 15 to the case. The switch lights up whenever it is pulled out, as it should. The Wt/Bl that goes to pin 85 on the relay comes from fuse #1. Shouldn't it go to ground? Otherwise the relay has 2 - 12v sources feeding the magnet of the relay. (IMG:style_emoticons/default/confused24.gif) EDIT: Now I'm wondering if the switch must be bad since the Fog Lamps works as long as the switch isn't mounted and grounded to the panel??? Not sure what is going on with your switch. What resistance do you measure when you state "I have continuity between..."? I assume you're using a VOM. Try this test with your 9V battery. Configure your VOM for amps and put the battery POS through the VOM (to measure current) and the other lead of the VOM to pin K and the NEG of the battery to the case. What current do you read? Do the same with pin 15. |
76-914 |
Aug 10 2021, 04:15 PM
Post
#24
|
Repeat Offender & Resident Subaru Antagonist Group: Members Posts: 13,611 Joined: 23-January 09 From: Temecula, CA Member No.: 9,964 Region Association: Southern California |
Jerry, With the switch pulled out - on position - I have continuity from all 3 pins to the case. With the switch pushed in - off - I have continuity between pin 31 and the case. Also, when I energized pin 31 with a 9v battery with the switch pulled out - on - I am getting 9v from pins K to the case & from pin 15 to the case. The switch lights up whenever it is pulled out, as it should. The Wt/Bl that goes to pin 85 on the relay comes from fuse #1. Shouldn't it go to ground? Otherwise the relay has 2 - 12v sources feeding the magnet of the relay. (IMG:style_emoticons/default/confused24.gif) EDIT: Now I'm wondering if the switch must be bad since the Fog Lamps works as long as the switch isn't mounted and grounded to the panel??? Not sure what is going on with your switch. What resistance do you measure when you state "I have continuity between..."? I assume you're using a VOM. Try this test with your 9V battery. Configure your VOM for amps and put the battery POS through the VOM (to measure current) and the other lead of the VOM to pin K and the NEG of the battery to the case. What current do you read? Do the same with pin 15. Jerry, I had an extra switch so I opened it up to see how it worked. What I found was that when the switch is in pushed in 31 & 15 are connected. When the switch is pulled out K joins the crowd & makes a connection to 15 & 30. And of course the body is connected to these as well. So once the switch is pulled out they all connect to one another. I don't understand how this could possibly work unless it has something to do with one of those diodes behind the Tach. I was sure that I'd find the 12v pin isolated from the ground pin next to it and that the switch would make contact between the 2 grounds when pulled out but it didn't work that way. (IMG:style_emoticons/default/confused24.gif) Either way this is above my pay grade and noting made any sense to me. When I checked resistance to the case I had the VOM set on 200 and if I read it correctly it was 1.46. I checked this with 2 different digital VOM's. I also checked it with the audible setting which is what I referred to as continuity between the pins and/or case. I eliminated the 12v Bk/Bl from the circuit and just switch between the Br & Gy/R which activates the relay and energizes the Fog Lamps. I'll post up some pics of the switch internals so you can see what I trying to say. BTW, what should I have set the ohm scale to when checking resistance? TIA, Kent EDIT: I'll check the current with the 9v battery tomorrow and get back to you with the results. Thx again. |
Lo-Fi Version | Time is now: 27th September 2024 - 01:11 PM |
All rights reserved 914World.com © since 2002 |
914World.com is the fastest growing online 914 community! We have it all, classifieds, events, forums, vendors, parts, autocross, racing, technical articles, events calendar, newsletter, restoration, gallery, archives, history and more for your Porsche 914 ... |