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Anonymous Waffle

76' 620: Fuse blows

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I've got a fuse blowing issue that I cannot for the life of me trace. The fuse that blows is the 10A Meter/Reverse/Regulator fuse. I have tried multiple solutions to find/fix the problem.

 

I have :

- Disconnected the regulator to test if that is the issue

- Disconnected the dimmer switch

- Pulled the entire gauge cluster out

- Replaced the entire fuse box with a new box

- Disconnected the engine bay inspection light

- Disconnected the 10 pin connector from the main harness to the cabin and back wires to isolate the tail lights and cabin accessories.

 

Things to note:

 

- My reverse is not hooked up

- The only aftermarket accessories are a tachometer and a electric fan, but the power and switches are either off the battery or resistor.

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Do you have a multimeter? And a diagram for your car?

 

You have a short to ground. Check for continuity through the connections. Find where you get no current flow.

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Reverse lights might not be hooked up, but where does the wires to the switch on the transmission go?  I had constant blown fuses on that circuit on my '76 KC- turned out the reverse switch wires had rubbed the insulation off on the torsion bar and were shorting out.

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Try unplugging the 4 way emergency flasher also.

 

If you have an automatic, unplug the kick down switch on the gas pedal.

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Sometimes I hate myself. Did alot of checking and testing, with and without a dmm.

 

Datsunaholic had it right on the money, I found my reverse lights were rubbed through and shorting out on the frame... Appreciate the help haha, feel free to delete this topic if you wish.

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 feel free to delete this topic if you wish.

 

Always good to keep problem threads with solutions for reference for anyone searching in the future.

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Agreed. I often modify the title to make it more relevant than "Help!". This post could save someone else a lot of bother.

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