Temperature gauge erratic
Thread Starter
Racer
Joined: Aug 2005
Posts: 442
Likes: 0
From: Fairbanks Alaska
Temperature gauge erratic
How about some help...
My '72 has a temperature gauge that reads correctly under steady RPMs (2500) but when accelerating or revving up it drops to 100 degrees until you let up. This happens quickly. I have replaced the sender, cleaned connections, ran a separate ground at the cluster. What is next? Rebuild the gauge, try another sender? Any help is appreciated.
Thanks,
Jim
My '72 has a temperature gauge that reads correctly under steady RPMs (2500) but when accelerating or revving up it drops to 100 degrees until you let up. This happens quickly. I have replaced the sender, cleaned connections, ran a separate ground at the cluster. What is next? Rebuild the gauge, try another sender? Any help is appreciated.
Thanks,
Jim
Race Director
Joined: May 2006
Posts: 16,528
Likes: 53
From: Dayton, Ohio
Falling to 100 usually means the wire coming from the sender has lost its ground. That usually happens when the wire falls off the sender,or the connector is loose on the sender, or the sender could loose its groound where it screws into the block-not likely OR and I have never seen it but IF the engine losts its ground it would also send the needle to 100.
Try running a temporary ground from the sender (threads) to the neg term on the battery and see if it still does it.
Try running a temporary ground from the sender (threads) to the neg term on the battery and see if it still does it.
Team Owner
Joined: Jan 2006
Posts: 37,637
Likes: 3,118
From: Crossville TN
Yep. The sender wire has a 'break' in it. Connection is OK when at stable speed, but the acceleration/deceleration causes the wire to lose connection. Just replace the wire between the sender and where it connects into the wiring harness. {It could also be a connector problem.}
Thread Starter
Racer
Joined: Aug 2005
Posts: 442
Likes: 0
From: Fairbanks Alaska
Thanks!
7T1,
You hit the nail on the head.. After a thorough investigation I found that the wire just inside the plastic insulator @ the sender unit was frayed. I simply re-crimped the terminal. Never overlook the easy stuff! My gauge works perfectly now.
Thanks guys,
Jim.
You hit the nail on the head.. After a thorough investigation I found that the wire just inside the plastic insulator @ the sender unit was frayed. I simply re-crimped the terminal. Never overlook the easy stuff! My gauge works perfectly now.
Thanks guys,
Jim.
