No accessory power

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Apr 28, 2020 | 04:24 PM

76Stingray@Mikes

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No accessory power

Hello, I purchased this 76 Vette slightly disassembled and have almost complete it. It has a new wiring harness in the cab that the previous owner installed. I am having problems getting power to my heater fan, windows wiper. There is no power at the fuses nor the actual switch. I have power to start the car and lights and when it runs, same thing no power to accessory's. Any help would be appreciated. I would like to say that I am new to these forum's. Hope I posted it in the right place.

Last edited by 76Stingray@Mikes; Apr 28, 2020 at 04:27 PM.

Apr 28, 2020 | 04:28 PM

Vetteman Jack

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May 1, 2020 | 02:36 PM

RedTRex

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Well assuming it is the correct harness, you should have all the info you need in your wiring harness link to track down the issue. https://docs.google.com/viewer?a=v&p...2E5ZTkxMTc1NmY

looks like lights are powered by orange which is probably hot all the time.

my guess is the ignition switch (electrical side) is malfunctioning and not giving you accessory power

May 1, 2020 | 03:20 PM

twinpack

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From: Monson MA

I just went through with my 68. In my case I had no power to the wiper, heater and radio. All the power to those currents comes from the ACC wire. Theis wire is powered in ACC a d run position. I found the wire in the fuse box was disconnected. Reconnected, power on all 3. Just a thought. I know there is a big difference between our years but I bet the theory hasn't changed.

May 1, 2020 | 08:30 PM

76Stingray@Mikes

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Thanks for the info guys really appreciate it, I just pulled the harness off the engine compartment side and noticed there was a prong pushed in and bent. Also noticed two wires cut coming off of it i did some power test and see that there is juice there. I will be doing some investigating and check where they all go. Probably going to change out the engine harness anyways as its starting to look really bad. I will make sure to keep you updated.

May 9, 2020 | 04:55 PM

76Stingray@Mikes

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So a little update. I found the problem for the windows and the heater. I was watching a video on you tube and they had shown a relay that was hidden under the tachometer cluster screwed to the floor. It was missing on mine. I put one in and boom it worked. The same thin goes with the heater. There is a relay on the engine wall where the wires connect, I pulled the connectors off and bypassed the power and bingo bango the heater worked. Like I said before the harness is in really bad shape so I will be ordering a new one. I have a couple of of wires cut off the harness that I believe feeds the windshield washer motor and I believe that it all has to be connected to complete the connection. You can correct me if I'm wrong.

Also I have 2 wires that come of the harness that feed the lights that are equipped with two rings one is orange and one is pink, they are molded together. Can someone tell me what they are for?

Thank you

Last edited by 76Stingray@Mikes; May 9, 2020 at 04:57 PM.