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I wanted to update this post incase anyone else wants to test their fuel gauge.
See pics.... If you use the reisistor, use a 6 ohm attach all 3 togethr then your leads to 1 & 2 = 6 ohms full tank then 1 & 3 12 Ohms than 1 and 4 for 18 ohms, or you can a 0 -100 resistor and test that way. I...
I had a similar issue with my Belvedere II... I spent hours trying to track down my issue.
Other symptoms I had... fuel gauge would read incorrect, and dash light issues... and the voltage gauge in the dash bouncing around at idle, and the voltage gauge would flucuate with the brake lights and...
testing
I get 8 ohms when I use my meter at the tank and the tank is full, so I know that reading is correct.
I can adjust the upper and lower limits of the gauge with a screw driver, but I prefer not to mess with that until the I get the proper resistance from the wire at the dash. When I...
Not there yet
So I did my bench test everything checked out. I metered out my wiring (violet) wire that connect to the dash... Placed the meter on ohm, and grouned black, and placed the red lead in the violet wire, and read ~67ohm, (with car running) so my guage read 1/4.... and at the fuel...
That was my issue as described in my prior post.... my gauges work!!!
As promised here is the pic of the new solid state regulator.
Used some hightemp silicone since my cap is sitting in the case... I didn't want to ground anything out. I also put some medium strength locktite on the screw...
I think I might have figured it out...
I metered out my board for continutity and found that when I checked from the ground to the 12v I was not seeing any... which is good.
Then I check from the 5v side and saw continutity which means it was grounded out.
When I pulled the dash out I...
I replaced my headlamp switch to fix an issue with my dash lights not working, and as long as I pulled my dash out I ordered I also replaced my voltage regulator, becuase my fuel gauge was not reading correctly.
After the re-assembly my accessory lights & blinkers work but my temp gauge and...
I forgot to add if there is a place to post service manuals I have a the Chrysler Shop Service manual for all 1966 B-Bodies that I would be happy to share.
After the circuit boards got cleaned up I found a small brake in a trace on the ground side of the voltage regulator. Soldering a connection there, and replacing the regulator seemed to fix the issue with fuel guage. I replaced the headlight switch, and now the accessory lights work on the dash...
Headlight switch replacment part
I brought my circuit boards into work, and the got bath in an ultrasonic degreser. I also ordered a new dash voltage regulator, and a new headlight switch... cost $70.00... Yes I said new.
I did find a NEW replacment headlight dimmer\switch for under $30.00...
update
I will take a look at it again, howerver I pulled the dash out to do some bench testing. I do have other gauges hooked up e.g. tach, temp, oil, ampmeter... those lights do turn on, but I don't recall if I hooked those gauges into the dash or headlight circuit. I should have the dash put...
I reviewed 3 other threads about dash light issues, but they don't match my issues.
A little background...
I replaced the switch that powers the lights on my car, because my headlights stopped working, but prior to that my dash lights stopped working.
After replacing the headlight...
I had a similar issue, first part of my issue was the fact I changed the pullies out to some performance pullies, once swapped my car stops charging when at idle. The issue I had with my battery crapping out was the fact the bolt that connects to the brake pedal that make the brake lights come...