74 gauge issues
Thread Starter
Instructor
Joined: Sep 2003
Posts: 190
Likes: 1
From: Greenville CA
74 gauge issues
I popped a fuse on my dual SPAL fan unit. Temp went up over 210, but did not boil. limped home, I was only a mile or two and traced issue to find the blown fuse on fans. replaced few and restarted car, Temp gauge did not work. Started to trace what the issue was with gauge, and eventually decided to pull dash cluster. Bought and installed new temp, fuel, and oil press gauges restart car, and now no reading on Temp, neg oil press showing and no movement on fuel gauge. Anyone hazard a guess on whether I have one, or multiple issues. Would a badd/no ground cause some/all of this? ammeter and clock work.. Thanks for listening! Mike
Melting Slicks
Joined: Apr 2009
Posts: 2,632
Likes: 112
From: Great Plains Iowa
I popped a fuse on my dual SPAL fan unit. Temp went up over 210, but did not boil. limped home, I was only a mile or two and traced issue to find the blown fuse on fans. replaced few and restarted car, Temp gauge did not work. Started to trace what the issue was with gauge, and eventually decided to pull dash cluster. Bought and installed new temp, fuel, and oil press gauges restart car, and now no reading on Temp, neg oil press showing and no movement on fuel gauge. Anyone hazard a guess on whether I have one, or multiple issues. Would a badd/no ground cause some/all of this? ammeter and clock work.. Thanks for listening! Mike
When you replaced the blown fuse for your fans you may have accidentally pulled the wire off your temperature sender if the fuse is anywhere close to the sender. I would check that before doing anything else.
Le Mans Master
Joined: Aug 2006
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From: mount holly NC
2025 c3 ('74-'82) of the Year Finalist - Unmodified
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First check the GAUGES fuse.
Since none of the gauges work you may have lost the ground.
The ground wire for all the gauges connects to a black wire on the center of the temp gauge.
The other end of that black wire connects to the 'A' pillar just above the bottom of the dash.
Listed as 'HARN GD' in this diagram.
Since none of the gauges work you may have lost the ground.
The ground wire for all the gauges connects to a black wire on the center of the temp gauge.
The other end of that black wire connects to the 'A' pillar just above the bottom of the dash.
Listed as 'HARN GD' in this diagram.
Last edited by Peterbuilt; Sep 18, 2015 at 10:18 AM.
