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#1 |
Registered User
Join Date: Feb 2008
Location: Surprise, Ariz.
Posts: 186
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hi, have a few ?,s about testing gauges mech. and electric in my 73 gmc truck. Q1-Have changed from the old style oil gauge to electric not after market. i have also a heavy duty oil pump. Do i need a different oil gauge to allow for the heavy oil pump? when engine running , gauge shows past 60. Q2- temp gauge mechanical doesn,t move. tried 2 others same results. chked sending unit connection - tight. the gauges when tested are
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#2 |
Registered User
Join Date: Dec 2004
Location: Highland, IN
Posts: 2,321
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Re: gauges
Check your connections for the oil pressure gauge. Be sure they are tight against the circuit board. I just had to pull half of mine out to clean and tighten them up
__________________
Chris _______________________________ 1979 Chevy Stepside SPORT 2018 Chevy Silverado, 39 years apart ![]() My build 2008-2016. http://m.imgur.com/a/bURrE |
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#3 |
Registered User
Join Date: Feb 2008
Location: Surprise, Ariz.
Posts: 186
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thanks chris, will do that. the circuit board is very new, bought on ebay. Shall i replace the temp sending part? i have many board clips for extras.
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#4 |
Moderator
![]() Join Date: Oct 2008
Location: Wentworth, NH
Posts: 4,951
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Re: gauges
Incredibly good post on Chris's 73-87 board about how to troubleshoot GM gauges. Print it off and read it...
http://forum.73-87chevytrucks.com/sm...1241#msg211241 The GM wiring manuals are here...
__________________
1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials...
And please let us know if and how your repairs were successful. |
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#5 |
Registered User
Join Date: Dec 2004
Location: Highland, IN
Posts: 2,321
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Re: gauges
I don't think you need to replace the clips. You can if you want. I pull mine. Hit with a wire brush. Bent the tabs to make them a tighter fit. A little squirt of dielectric grease and put back to gether. Works great. Also did that to all my bulbs. Clean. Bend. Grease as for the temp. Not sure how that works but there is not a lot there to break. So I would try a new sending unit
__________________
Chris _______________________________ 1979 Chevy Stepside SPORT 2018 Chevy Silverado, 39 years apart ![]() My build 2008-2016. http://m.imgur.com/a/bURrE |
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#6 |
Registered User
Join Date: Feb 2008
Location: Surprise, Ariz.
Posts: 186
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Hi chris, opened the link you sent and printed 5 of 8 pages. read about temp gauge and ran a test with my actron meter tester. following step 4 in testing procedure i made the test meter the sending unit by attaching the red wire to the sender wire and grounded blk wire to the body. turned ignition ON. test worked fine . the temp gauge showed left line (when hot) the temp gauge went to right line on gauge when the meter showed 51 ohms. i am a novice with the meter, i was taught about volts and resistance settings. The next day i turned the ignition ON and the pointer was at the left line 100. the oil temp gauge is OK. fuel is OK volts OK. i removed all the clips and bent the sides to make tighter. put bulb grease in the bulb connectors. i have this electrical spray MP3 great for all electrical needs. Thanks again for link and info for gauges, it is very helpful. i hope i didn't confuse. frankyt 73 gmc owner/restorer long bed 350 bored 4.0 rv cam and a lot of extras.
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#7 |
Moderator
![]() Join Date: Oct 2008
Location: Wentworth, NH
Posts: 4,951
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Re: gauges
I'm not Chris.
![]() hatzie is fine. Even folks that know me call me that. No problem on the link. Glad it helped. It's one of the best writeups on these gauge panels I have ever seen.
__________________
1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials...
And please let us know if and how your repairs were successful. |
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