Gauge swap, not working now - Team Camaro Tech
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post #1 of 5 (permalink) Old Mar 26th, 16, 02:17 PM Thread Starter
Mike
 
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Gauge swap, not working now

So some genius back in the day decided to put first gen Firebird gauges in my 67 Camaro. I bought new Speedo and Fuel gauge from OEM, I very carefully took the dash apart put the carrier on my work bench a meticulously disassembled the gauges watching where each piece came from and reassembled it. I did notice the circuit board was a little frayed how ever i tested it and all points a to b had power (from the connector to each item). I put the whole thing back together and of course... it does not work. Everything seems to have power however it seems to be shorted out. When I run the tester the the needle goes negative instead of positive. None of the lights work except for the GEN. If I turn on the directionals I have power and the tester needle goes up and down, but the bulbs dont work (all new bulbs). Also the Fuel gauge is all the way past full. I tried creating a independent ground to the carrier but it did not work. Is there a difference between a firebird circuit board and a Camaro? or do you think its just bad grounding out somewhere? Should I just order a new board?
Help!

Thanks
Mike

Mike
1967 Camaro rs
369 4bbl (Q-jet )
4 Speed ( M-20 )
GM HEI Ignition

Torch Red /White Rally Stripes
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post #2 of 5 (permalink) Old Mar 26th, 16, 02:42 PM
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Re: Gauge swap, not working now

In these bench testings you did ground the instrument carrier? And when installed the ground from the top screw is good?


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post #3 of 5 (permalink) Old Mar 26th, 16, 02:42 PM Thread Starter
Mike
 
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Re: Gauge swap, not working now

I did notice this, The Firebird Gas gauge had this on it, the Camaro one just has a piece of plastic.
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Mike
1967 Camaro rs
369 4bbl (Q-jet )
4 Speed ( M-20 )
GM HEI Ignition

Torch Red /White Rally Stripes
Torque Trusts with BFG's

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post #4 of 5 (permalink) Old Mar 26th, 16, 02:44 PM Thread Starter
Mike
 
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Re: Gauge swap, not working now

I tested it on the "bench" and plugged up to the dash board harness with an extra ground from the firewall to the carrier.

Mike
1967 Camaro rs
369 4bbl (Q-jet )
4 Speed ( M-20 )
GM HEI Ignition

Torch Red /White Rally Stripes
Torque Trusts with BFG's

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post #5 of 5 (permalink) Old Mar 27th, 16, 06:07 AM
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Re: Gauge swap, not working now

Quote:
Originally Posted by Mikecio1 View Post
I did notice this, The Firebird Gas gauge had this on it, the Camaro one just has a piece of plastic.
All GM fuel gauges of that era had external resistors to correct the gauge to the 0-90 Ohm's standard of the in tank senders. These were Mylar wrapped in thin gauge wire. If yours is missing the wire it won't be correcting anything and your gauge will be wrong. New replacements are a ceramic shunt color coded. Have you run the fuel gauge trouble shooter to test the gauge and the sender? You may be chasing several tails at once with a bad sender ground or bad sender. https://www.camaros.net/forums/19-ele...n-69-pace.html

Quote:
Originally Posted by Mikecio1 View Post
I tested it on the "bench" and plugged up to the dash board harness with an extra ground from the firewall to the carrier.
Ok so sounds like the bench test was grounded ok. Your issue besides a ground issue may be bad or wrong printed circuit. Can you post a picture of the PC?


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