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> Electric Avenue is Bright, Finishing the ABM Electrics
EdwardBlume
post Jun 13 2015, 01:40 AM
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I tested the battery tonight and its putting out a charge. The ABM from what I can tell, has a new engine harness, MSD, JWest fuse panel, a blasted interior, H4s with relays, and a newerish stock board.

With nothing "on", hooking up the battery seems to "arc" the front headlight motors, or something up front.

Transmission ground is on, battery (-) is ground, front turn signal grounds are attached.

Nothing at the ignition, although with light switch "on" no "arc" but no light. Ignition switch seems loose. Wiper handle is very loose.

I bought a color diagram, but I'm color blind.

Is there a method to trace electricity step by step from the battery out through the harness, into the dash, and out to the lights?

I need to get this ABM on the road!
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76-914
post Jun 13 2015, 07:57 AM
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QUOTE(RobW @ Jun 13 2015, 12:40 AM) *

I tested the battery tonight and its putting out a charge. The ABM from what I can tell, has a new engine harness, MSD, JWest fuse panel, a blasted interior, H4s with relays, and a newerish stock board.

With nothing "on", hooking up the battery seems to "arc" the front headlight motors, or something up front.

Transmission ground is on, battery (-) is ground, front turn signal grounds are attached.

Nothing at the ignition, although with light switch "on" no "arc" but no light. Ignition switch seems loose. Wiper handle is very loose.

I bought a color diagram, but I'm color blind.

Is there a method to trace electricity step by step from the battery out through the harness, into the dash, and out to the lights?

I need to get this ABM on the road!

Rob, Pull one fuse at a time until it doesn't arc when reconnecting the cable. Or, use a meter to check for amp pull. Same result. Once you've identified the circuit start tracing it down. GL w/ the color blindness thing. I'm hue blind. Used to mix up my socks all the time. Now I just wear white socks. (IMG:style_emoticons/default/av-943.gif)
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Mike Bellis
post Jun 13 2015, 08:42 AM
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Verifying the entire systems can take several days/weekends. It's most challenging with color blindness. Sounds like you need a build party! (IMG:style_emoticons/default/piratenanner.gif)

Or, I can wait until you are totally frustrated and buy the car off you super cheap... (IMG:style_emoticons/default/happy11.gif)
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Andyrew
post Jun 13 2015, 08:48 AM
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QUOTE(Mike Bellis @ Jun 13 2015, 07:42 AM) *


Or, I can wait until you are totally frustrated and buy the car off you super cheap... (IMG:style_emoticons/default/happy11.gif)



That was the plan I had with your car.... (IMG:style_emoticons/default/chowtime.gif)
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Mike Bellis
post Jun 13 2015, 09:06 AM
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QUOTE(Andyrew @ Jun 13 2015, 07:48 AM) *

QUOTE(Mike Bellis @ Jun 13 2015, 07:42 AM) *


Or, I can wait until you are totally frustrated and buy the car off you super cheap... (IMG:style_emoticons/default/happy11.gif)



That was the plan I had with your car.... (IMG:style_emoticons/default/chowtime.gif)

(IMG:style_emoticons/default/av-943.gif)

(IMG:style_emoticons/default/slap.gif)
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Tom
post Jun 13 2015, 01:29 PM
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Being color blind and not having a full understanding of what you are working on can lead to trouble. Get Mike to come over and fix that electrical system. You will learn while he is helping you and he understands how to keep it safe.
The first step when you hook something up electrically and it "arcs" is to remove power and leave it removed until the problem has been defined and repaired.
Tom
Electrical/electronics for 49+ years and red/green color blind. There are ways to overcome being color blind and still be effective.
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EdwardBlume
post Jun 16 2015, 06:42 PM
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So black is your always on power right? What is always on in the front trunk? Plus, if the fuel pump in the front trunk was not connected to anything could this be my arc without ignition?
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Mike Bellis
post Jun 16 2015, 08:32 PM
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QUOTE(RobW @ Jun 16 2015, 05:42 PM) *

So black is your always on power right? What is always on in the front trunk? Plus, if the fuel pump in the front trunk was not connected to anything could this be my arc without ignition?

If your fuel pump was not connected and the wire were not touching anything, that is not the cause of your spark.

Red is constant power at the headlight relay. Not black. Black from your ignition switch is "hot while cranking".

When's the build party? (IMG:style_emoticons/default/chair.gif)
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r_towle
post Jun 17 2015, 09:48 AM
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pull every fuse, see if the batter sparks.
If YES, you have an aftermarket circuit that you need to find.

IF NO
Add one fuse at a time, repeat test till you find the culprit.

rich
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Kansas 914
post Jun 17 2015, 10:41 AM
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QUOTE(r_towle @ Jun 17 2015, 09:48 AM) *

pull every fuse, see if the batter sparks.
If YES, you have an aftermarket circuit that you need to find.

IF NO
Add one fuse at a time, repeat test till you find the culprit.

rich

(IMG:style_emoticons/default/agree.gif)
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Dave_Darling
post Jun 17 2015, 11:58 AM
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There are, sadly, some unfused circuits. Even on cars with unmodified wiring. I don't remember what they are offhand, but digging through the wiring diagrams will show them. Look for lines coming straight from the battery that don't go through any "Sx" (where x is a number) before getting to some component.

--DD
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Kansas 914
post Jun 17 2015, 01:07 PM
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QUOTE(Dave_Darling @ Jun 17 2015, 11:58 AM) *

There are, sadly, some unfused circuits. Even on cars with unmodified wiring. I don't remember what they are offhand, but digging through the wiring diagrams will show them. Look for lines coming straight from the battery that don't go through any "Sx" (where x is a number) before getting to some component.

--DD

DD - I didn't know that about unfused circuits - or if it was mentioned before I chose to forget it as it is scary.

We should document that here for future reference. That is important to know.

Thanks!
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JeffBowlsby
post Jun 17 2015, 03:04 PM
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Here is my unfused circuits list for a 1974 914.


Attached image(s)
Attached Image
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Mike Bellis
post Jun 17 2015, 06:38 PM
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The 4 red wires (some have 5) connected to the positive battery terminal are the unfused circuits. One goes to the ignition switch. One goes to the fuse panel. One goes to the relay board (some have 2) and one to the alternator.

I think Tom was selling an add on fuse panel for this location. If you fuse these near the battery (within 18 inches) you will be safe.
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Kansas 914
post Jun 19 2015, 08:38 AM
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Jeff and Mike

Thanks for the info it is most helpful. Cheers!
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EdwardBlume
post Jul 13 2015, 10:58 PM
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Update: I added fuses to the fuse box... that should help.

Installed the CDR220 but theres quite a few stray wires under the dash. Will dig some more this weekend.
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EdwardBlume
post Jul 13 2015, 11:02 PM
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QUOTE(Jeff Bowlsby @ Jun 17 2015, 02:04 PM) *

Here is my unfused circuits list for a 1974 914.

If there are unfused circuits, does that mean there will be power drawn for testing for shorts.. i.e. the clock?
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JeffBowlsby
post Jul 13 2015, 11:16 PM
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QUOTE(RobW @ Jul 13 2015, 10:02 PM) *

QUOTE(Jeff Bowlsby @ Jun 17 2015, 02:04 PM) *

Here is my unfused circuits list for a 1974 914.

If there are unfused circuits, does that mean there will be power drawn for testing for shorts.. i.e. the clock?


Nope. Clock is on Fuse 11. You have a factory wiring schematic and know how to read it right?
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EdwardBlume
post Jul 13 2015, 11:58 PM
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QUOTE(Jeff Bowlsby @ Jul 13 2015, 10:16 PM) *

QUOTE(RobW @ Jul 13 2015, 10:02 PM) *

QUOTE(Jeff Bowlsby @ Jun 17 2015, 02:04 PM) *

Here is my unfused circuits list for a 1974 914.

If there are unfused circuits, does that mean there will be power drawn for testing for shorts.. i.e. the clock?


Nope. Clock is on Fuse 11. You have a factory wiring schematic and know how to read it right?

Yes, thanks. I got the color laminated one. Just not in front of me right now. I'll post picts of the stray wires to see if the right places can be attached.
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walterolin
post Jul 14 2015, 02:48 AM
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Color laminated one is easier to follow, but be aware it has some missing elements. For example the internals of the door switches are not drawn. You will need the Haynes schematics to use together with the color version.

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