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Old 08-19-2008, 10:04 PM
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70 SS non gauge printed circuit board


I have been restoring a matching # 's, 70 SS 396 Chevelle, off & on for approx. 8 years, when time has allowed. I have taken it off the frame & also placed the car on a rotisserie. I am in the process of putting the dash back in the car & hopefully have figured it out, (after burning 2 circuit boards), that the 2 black ground wires, in the harness, do not go to the back of the fuel gauge. I knew they were ground wires & assumed this is where they went, since there are to threaded studs on the back of the fuel gauge. I have been told, that they are to be connected to the metal housing of the case, that holds all of the gauges? Hopefully, some one can confirm this, I do not want to burn up another circuit board. What has happened previously, when I turn the key on, it quickly makes a small popping sound & is followed by the smell of burnt wiring. It has burnt the circuit board in the same place both times.

The strange thing is, that I had already had the dash in the car with the original circuit board & I believe it was hooked up the same way, and did not have this problem. I have already started the car & broke the motor in, and then pulled the dash back out to replace the circuit board with a repo & change all of the dash light out to LED'S. Does anybody have a answer?

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Old 08-20-2008, 05:38 AM
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welcome...moving to electrical
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Old 01-24-2011, 04:37 PM
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if you do a search of my journal and or my photo album, i think you will see where i did something similar in my 72 camaro (just without frying anything). i think they are the same. i don't think i have the wiring diagram for the conversion on there tho. as i recall, there is a nut or two somewhere on one of the gauges, that you have to make sure you do not connect them to ground. it has been too long for me to remember. what i did was go from the generic instrument cluster with gas gauge and dummy lights, to one with a tach. and all the gauges.

yeah, it's on page one of my journal, what i was talking about. anyway. maybe you should make sure the number of the full instrumentation option was the same: U14. it may or may not matter. however you can try www.chevelles.com i think is the site, or for the camaro, i know they have the wiring diagram there, at www.nastyz28.com and good luck.

one thing i CAN tell you for sure, is that if you fried TWO ckt boards wiring it the same way, you have to WIRE IT A DIFFERENT WAY!

Last edited by bullheimer; 01-24-2011 at 04:42 PM.
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Old 01-25-2011, 11:53 AM
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Looking at the diagram it shows that the fuel gauge has a fused 12 volt + wire from the instrument power fuse. It's a PURPLE 20 ga. wire.

From the gauge is a TAN wire that runs to the tank sender. This wire completes the circuit through the tank sender resistor to ground.

There is also a grounded black wire connected near the gauge but it is not part of the gauge system. It is possibly for the light. The gauge should have only (2) terminals.

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