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76' 620: Fuse blows


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#1 Anonymous Waffle

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Posted 17 November 2017 - 03:01 PM

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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#2 flatcat19

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Posted 17 November 2017 - 03:13 PM

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.

You can't hang if your nuts haven't dropped...it's physics


#3 datsunaholic

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Posted 17 November 2017 - 03:29 PM

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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#4 datzenmike

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Posted 17 November 2017 - 05:00 PM

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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#5 Anonymous Waffle

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Posted 17 November 2017 - 07:38 PM

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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#6 Skib

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Posted 17 November 2017 - 09:09 PM

 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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#7 datzenmike

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Posted 17 November 2017 - 09:19 PM

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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#8 Anonymous Waffle

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Posted 18 November 2017 - 07:47 AM

Alright cool, thanks again for the help!

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#9 banzai510(hainz)

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Posted 18 November 2017 - 09:28 PM

I seen a sheetmetal screw thru a floor and hit a wire.= short!!!!!!!!!


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