Electrical Schematics

[Guardian]

Here are the schematics that I have for squares, just wanted to share them.

http://www.gmsquarebody.com/forum/album.php?albumid=278

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[FRANKENTRUCK]

These are great! Perhaps one of these will help me convert my idiot light setup to an all-gauges one. If one of this type is not here perhaps you have one...?

 

[Guardian]

These provide the information about pin locations and the termination that are factory so it should be helpful.

 

[89Suburban]

Thank you for that Jeff.

 

[Guardian]

Glad to help.

 

[Brandon_l1000]

yeap that deff helps thanks

 

[89Suburban]

Glad to help.

Gaurdian go bye bye.

 

[onetonfanatic]

These are good but need more on the headlight switch and running lights/tail lights my 1988 Chevy R30 blows fuses been trying to find out what my be the cause seems to pop fuses when I plug in radio so I would like to trace out wiring to see what is wired wrong thanks

 

[HotRodPC]

Did you look in the The Squarebody Reference Library category? There are some GM Year Specific manuals in there. Just to have + them real big to see them but they work. If there isn't one for 83, look for 81 or 82 will be closer to your truck. In 84 GM went to the Multifunction switch on the column, so that one will be a bit different than yours.

 

[RetroC10Sport]

He says 1988. Fanatic, PM forthcoming.

 

[chengny]

1988 Chevrolet GMC Light Truck Wiring Manual Complete (454 pages - PDF):

http://depositfiles.com/files/1w2mkrb0s

No PW needed to extract

 

[Old77]

Can someone tell me the bulb sizes for the tails? I think I know what the taillight bulb is but what is the reverse light? I didn't see that info in the above diagrams.

 

[RetroC10Sport]

1156? @Old77

 

[Old77]

Perfect! Thank you, sir

 

[HotRodPC]

Yup, Elebum Fitty Sebum and Elebum Fitty Six will be most common bulbs on our Squares, and most USA made vehicles for the 70's and 80's for that matter.