1953 M37 Water temp guage

[captkennyboy]

Hi all I replaced the watertemp gauge and sending unit on my 1953 M37. It worked for 10 days perfectly and then just pegged over to the farright. All the other gauges are workingand I swapped the ground wire with the fuel gauge to see if it was the groundand the fuel gauge worked perfectly. Any ideas? Could the sending unitthat was new be faulty? How do I testthe gauge and the sending unit? Thanks forthe help in advance

 

[M543A2]

I do not know for sure, but you might try disconnecting the wire from the sending unit to the gauge on both the gauge and sending unit ends and test for it being grounded somewhere. With both ends disconnected I do not think you should show it grounded when you check continuity to ground. Maybe also it has lost its coating somewhere and is shorting to an adjacent wire. Can you fashion a test wire from the sending unit to the gauge and see if it works OK then? I have not had this happen, but these are ways I have tested similar problems in the past.
Regards Marty

 

[captkennyboy]

thanks for the fast reply. I tried that and the wire from the sending unit does not ground out so i assumed it was solid. do you think the new sending unit could be bad?

 

[Thunder in NWOR]

Call John at Midwest Military.
He has all the answers for 3/4 ton Dodges.
I have picked his brain and have purchased a lot of stuff over the years from him.
Most often has the answer.
Mark

 

[captkennyboy]

thanks great info

ken

 

[Juskatla]

I've used this information to troubleshoot my gauges before and found it useful...
http://www.dodgepowerwagon.com/best/m37_gauge_resistance.php

Jess

 

[captkennyboy]

excellant thanks