04-04-2021, 05:25 PM | #1 |
Registered User
Join Date: Aug 2016
Location: Excello MO
Posts: 36
|
Engine harness
Putting my truck back together, I have a 1977 under dash gauge/harness and I’m attempting use a 1976 idiot/light engine harness. What is going to be the outcome , anybody know ??
Posted via Mobile Device |
04-05-2021, 06:38 PM | #2 |
Registered User
Join Date: Nov 2009
Location: Sherman, ME
Posts: 2,366
|
Re: Engine harness
I think you'll be okay with that combination.
Looking at the wiring diagrams for both years and comparing the pinouts of the firewall bulkhead connectors, it looks like all of the major circuits in the engine harness kept the same terminal locations. The warning light style engine harness will have a dark blue wire for an oil pressure light switch. Assuming you're using the '77 gauge cluster w/mechanical oil pressure gauge, you can simply leave that wire unused. Both gauge & warning light style engine harnesses have a dark green wire for the temp gauge or temp light. Just make sure you have the correct sending unit (for the temp gauge, not a switch for a temp light) installed in the engine. |
04-05-2021, 07:43 PM | #3 |
Moderator
Join Date: Oct 2008
Location: Wentworth, NH
Posts: 4,977
|
Re: Engine harness
The beautiful thing about the 73-76 lamp harness is you already have an oil pressure sensor wire to the cluster so you can use the more plentiful 78-80 tach clusters.
__________________
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. |
Bookmarks |
|
|