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Posted by: ri914 Oct 21 2020, 07:52 AM

Ever have the fuel pump kick on when you turn on the marker lights? how about the headlights deciding to work sporadically coupled with no brake lights or turn signals...

Not sure this is worth trying to track or chase down. I have all the wiring diagrams and everything matches, so I know i have the correct wires.

I am thinking my headlight switch is bad and possibly a few other items. I am thinking it might be easier to rewire these functions but willing to give it a few more tries if anyone has been down this road before.

Any thoughts or good threads I should study?

thank you



So many helpful fixes, down to 1 thing left, the turn signals, detailed diagnosis on my last post...

Posted by: ri914 Oct 21 2020, 07:54 AM

Update 1: The fuel pump also cycles with the emergency flashers.

Update 2: No rear lights are working, fuses are all good.

Posted by: michelko Oct 21 2020, 08:03 AM

Maybee a grounding issue? check this first, also check the fuses and the fuseholder for corrosion.

Michael

Posted by: yellowporky Oct 21 2020, 08:07 AM

Clean every ground post on the car. Power is finding new paths to ground

Posted by: ri914 Oct 21 2020, 08:17 AM

thanks Team, I will clean all the ground posts and see what happens.

Posted by: ri914 Oct 21 2020, 09:09 AM

Update 3: I found a ground ring floating in the engine bay under the circuit/power board behind the driver seat. It had 5 brown wires. Once I attached that correctly. flashers turn signal, hazards and hi beams now all work!!! No random fuel pump operating. I really need to learn more about how an unconnected ground could cause these anomalies.


Fixed the low beam. issue was the fuse not conducting properly. Will upgrade the fuse box to the blade style.

Thank you for all the help.

Posted by: barefoot Oct 21 2020, 09:20 AM

That' not the correct fuze identification for 914-4's :

First fuze (on right) is left headlite hi beam, 2nd is rt hi beam, 3rd is left low beam, 4th is rt low beam

Posted by: 76-914 Oct 21 2020, 09:29 AM

Basically, electricity is always seeking a ground. If one isn’t provided it will find one. We have a bunch of EE’s here that can give you a detailed explanation

Posted by: Superhawk996 Oct 21 2020, 03:00 PM

Unintended ground path are a major source of gremlins

Posted by: djway Oct 21 2020, 03:13 PM

One thing I have learned after many years with AirCooled
Always start with the grounds.........

Posted by: JeffBowlsby Oct 21 2020, 04:59 PM

The fusepanel change to bladed style is not an upgrade.

Just clean and maintain the factory fusepanel and you should have no problems.

Posted by: AZBanks Oct 21 2020, 05:16 PM

Does anyone have the correct fuse diagram for the 914-4 fuses?

Posted by: ri914 Oct 21 2020, 05:18 PM

Thanks Jeff, You just saved me 155.00 I am going to clean them and purchase some new fuses. is there a better way to clean? crc contact cleaner, or should I use a wire brush?

Posted by: ri914 Oct 21 2020, 05:32 PM

I found this jpeg online. Seems to follow everyone's comments. Not sure its 100% correct, but I bet a few of the readers can confirm.

Posted by: StarBear Oct 21 2020, 05:54 PM

On mine, they are indicated on the fuse panel’s clear plastic cover. Just make sure the cover isn’t on upside down!

Posted by: JeffBowlsby Oct 21 2020, 06:01 PM

DeOxit is my go to cleaner. Use a small wire brush also, especially if visually oxidized.

Posted by: ri914 Oct 27 2020, 02:04 PM

Update...

Ok so everyone has helped me get brakes, headlights, high beams, emergency flashers, running lights, markers and fix all the grounds. I had to clean the fuses and replace some. clean bulbs and follow quite a bit of wiring schematics. Also a big thank you to all who spent time sending everything.


Sooo.. I only have 1 issue left....


TURN Signals, they used to work when all my grounds where messed up, now nothing. The emergency flashers work and Fuse 9/11 is all good and conductive, but no flashing of the turn signals..

I also noticed the brake light power does not work (for now I ran a wire from fuse 9 to the pedal switch and its all good. Could this be the relay? the turn signal stalk? power not getting to the column? I thought power for the brakes was direct from the fuse?

I am at a loss as to what to tear into, last week i did have the right side flasher working. Any help would be great.

Posted by: lierofox Oct 27 2020, 02:40 PM

Brake light switch and turn signals, when the hazard switch knob is pushed in, should receive power from Fuse 9 (on with key On.)

Hazard switch switches over to Fuse 11 (always hot) instead when the knob is pulled out.

Are you testing this with the key switched to On?

Also, have you pulled down the fuse panel to make sure the spade connectors on the back of the block are plugged in, tight, and free from corrosion?

(I'm guessing all of the above is good since you mentioned you've been able to get the brake lights working.)

You can try pulling out the hazard switch and probe terminal 15 with the knob pushed in to make sure there's 12v going there, as well as terminal 49.

Try taking a look at the wiring going up the steering column to the turn signal stalk, if you peek under the lower dash pad, double check to make sure the connectors there are firmly pushed in all the way.