Water Temp Gauge questions

[Don Rudolph]

After installing a new wiring harness on our 430 the temp gauge does not register. Is it possible I have the wires on the wrong terminals? If not, is there any way to test the gauge and sending unit? Thanks, Don

 

[Jim.ME]

Did it work before you installed the new harness? If it did, you might have the wires reversed on the gauge.

You said it doesn't register not it goes full scale and stays there. Most gauges will read full scale if you unhook the wire from the sender and ground the wire to the block. That is the common first test to try for a gauge. They normally go to zero, or base reading, when not grounded. If it didn't move when you unhooked and grounded the sender, unhook that same wire from the gauge and ground the gauge terminal to rule out a break, a short, or other problem with that wire.

 

[Don Rudolph]

Thanks for the diagnostic information. I'll try it out. Don