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73-87 Chevy _ GMC Trucks => Electrical => Topic started by: Cory on August 01, 2014, 02:37:36 pm

Title: Testing fuel sending unit
Post by: Cory on August 01, 2014, 02:37:36 pm

Does anybody know which terminals on the headlamp switch do you connect the pink wire and ground wire going to the sending unit in order to test it? I read an old post from HAULIN IT that said you could use an old headlamp switch as a variable resistor and use it in place of the fuel sending unit to see if the gauge moves or not, but there are several different numbered terminals on the dimmer switch. I'm not sure which terminals to use. Any help would be appreciated!!

86 C10 350/700r4 single tank under the driver

Title: Re: Testing fuel sending unit
Post by: bd on August 01, 2014, 04:03:21 pm

Use the two terminals circled in red, below.

Title: Re: Testing fuel sending unit
Post by: Cory on August 01, 2014, 04:13:01 pm

Thank you bd!!

Title: Re: Testing fuel sending unit
Post by: Irish_Alley on August 01, 2014, 11:00:33 pm

whats your gauge reading?