Weekend Junkyard score - The 1947 - Present Chevrolet & GMC Truck Message Board Network

ECU PIRATE · 10-22-2012, 07:22 AM

Managed to pick this up @ the local pick and pull on Saturday for $ 27.00. I pulled it out of a 75' K10 with a 350/SM465 set up. I thought it was a good deal considering I almost missed this in a truck I had pulled some parts off of on my way out. I should have pulled the whole harness out to re-wire my 82' to make this work.

bigwheel15 · 10-22-2012, 12:15 PM

Sounds like a good deal to me, I still pop my head in every square body at the junkyard just on the off chance there's a tac dash in it.

rfmaster · 10-22-2012, 01:59 PM

You do not need to re-wire the harness. You'll (probably) have to move several pins on the main connector that plugs into instrument cluster. The main problem that I see is that 75 used charging amp-meter vs. voltmeter used on 76 and up. IFIK it is possible to transplant a volt meter from a later cluster into 75 cluster, but this may require some harness re-work. Another possibility is to get a 76 and up PCBA and install later model gauges. IRC tachometer is a standalone module.

I would get the two wiring harness diagrams (75 and 82) side by side and make a list of changes to make it work. I have 75 factory wiring diagram supplement - let me know if you need a scan copy.

//RF

ECU PIRATE · 10-22-2012, 02:24 PM

Quote:

Originally Posted by rfmaster

You do not need to re-wire the harness. You'll (probably) have to move several pins on the main connector that plugs into instrument cluster. The main problem that I see is that 75 used charging amp-meter vs. voltmeter used on 76 and up. IFIK it is possible to transplant a volt meter from a later cluster into 75 cluster, but this may require some harness re-work. Another possibility is to get a 76 and up PCBA and install later model gauges. IRC tachometer is a standalone module.

I would get the two wiring harness diagrams (75 and 82) side by side and make a list of changes to make it work. I have 75 factory wiring diagram supplement - let me know if you need a scan copy.

//RF

Thanks rfmaster. Scan a copy of the 75 harness wiring diagram and send it to me at ecupirate98@cox.net. My truck is an original 6 banger wiht idiot lights so soem major things might have to happen or, I take the easy way out and hook up my 2 5/8" Autogage gauges along with my 5" Autogage monster tach. I just might have to save this cluster for me next project (hopefully a full convertible K5).

Mike

rfmaster · 10-22-2012, 03:38 PM

OK - give me a day to drag it to the office scanner - copier.

//RF

**hatzie** · 10-23-2012, 10:19 AM

Careful of putting a 73-75 cluster in 76-91 trucks. They have an ammeter and it will cause a fire if you're not careful.

10-22-2012, 07:22 AM	#1
ECU PIRATE Registered User Join Date: Apr 2009 Location: Centreville, Virginia Posts: 846	Weekend Junkyard score Managed to pick this up @ the local pick and pull on Saturday for $ 27.00. I pulled it out of a 75' K10 with a 350/SM465 set up. I thought it was a good deal considering I almost missed this in a truck I had pulled some parts off of on my way out. I should have pulled the whole harness out to re-wire my 82' to make this work. Attached Images __________________ The Fleet........ 68' Camaro - 1st car (restored & still have it) 09' VW Tiguan (Wife's Daily Driver) 14' VW Passat SE TSI (my personal) 14' Ford Edge Sport (Daily Work Vehicle) 73' SWB Stepside - 77K org. miles 74' LWB 454/TH400 - drive train transplant for my (Sold) 98' SWB C1500 W/T - shop truck (Sold) 90' GMC Sierra SLE short step - aka " Jezabelle " (Sold)

10-22-2012, 12:15 PM	#2
bigwheel15 Registered User Join Date: Feb 2010 Location: Fort Worth, TX Posts: 727	Re: Weekend Junkyard score Sounds like a good deal to me, I still pop my head in every square body at the junkyard just on the off chance there's a tac dash in it.

10-22-2012, 01:59 PM	#3
rfmaster Registered User Join Date: Oct 2003 Location: OC CA Posts: 1,374	Re: Weekend Junkyard score You do not need to re-wire the harness. You'll (probably) have to move several pins on the main connector that plugs into instrument cluster. The main problem that I see is that 75 used charging amp-meter vs. voltmeter used on 76 and up. IFIK it is possible to transplant a volt meter from a later cluster into 75 cluster, but this may require some harness re-work. Another possibility is to get a 76 and up PCBA and install later model gauges. IRC tachometer is a standalone module. I would get the two wiring harness diagrams (75 and 82) side by side and make a list of changes to make it work. I have 75 factory wiring diagram supplement - let me know if you need a scan copy. //RF __________________ "The Beast" 1975 Chevrolet C20 longbed 350/700R4! with 3inch body lift Dual Flowmasters Super 40's! TBI retrofit completed (2007-07-29) New 383CID (+030) 08-304-8 9.5:1CR x36,005 (2012-12-17)

10-22-2012, 03:38 PM	#5
rfmaster Registered User Join Date: Oct 2003 Location: OC CA Posts: 1,374	Re: Weekend Junkyard score OK - give me a day to drag it to the office scanner - copier. //RF __________________ "The Beast" 1975 Chevrolet C20 longbed 350/700R4! with 3inch body lift Dual Flowmasters Super 40's! TBI retrofit completed (2007-07-29) New 383CID (+030) 08-304-8 9.5:1CR x36,005 (2012-12-17)

10-23-2012, 10:19 AM	#6
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,941	Re: Weekend Junkyard score Careful of putting a 73-75 cluster in 76-91 trucks. They have an ammeter and it will cause a fire if you're not careful. __________________ 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... 1973-1991 GM Light Truck Service, Unit/Overhaul, Wiring Manuals, Parts Books and Some 1968-1999 GM Service Training textbooks in PDF 1988-1998 GMT400 CK service manual project 1988-1993 GMT400 CK parts books. 1967-1972 GM Light, Medium, & Heavy Truck Service Manuals in PDF Please include at least the year and model in your threads. It'll be easier to answer your questions. And please let us know if and how your repairs were successful.



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