1975 alternator and starter wiring
 

I bought this truck with no motor or transmission. Most of the wires coming from the firewall have been cut. I just recently dropped in a 455 and a 400turbo and now I'm having trouble getting it all wired in. I have a diagram that shows all the wires coming from the block in the firewall but it isn't correct. Can anyone help me out here.
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Re: 1975 alternator and starter wiring
 

Welcome to the site. Does your wiring diagram match these http://forum.73-87chevytrucks.com/sm...c,11766.0.html ?

Re: 1975 alternator and starter wiring
 

This is for a 1976 but your 75 should be same, espcially for starter/alternator. I used this on my 1976 and had no issues. The wire colors on this chart match actual wire colors.

hope this helps :smoke:

since you have a V8 this should be the ones you need, most will have their own connectors and length will determine placement so you shouldnt be able to get them crossed.

#8 bulkhead junction block = PINK/ distributor coil
#9 bulkhead junction block = dark blue/oil press sw behind distributor
#10 bulkhead junction block = brown/alternator
#11 bulkhead junction block = violet/starter ign small terminal
#12 bulkhead junction block = red /small upper firewall juinction block/starter/alternator (should split off internally in the harness)
#14 bulkhead junction block = DARK BLUE/windshield wiper motor connection
#15 bulkhead junction block = light blue/windshield wiper motor connection
#16 bulkhead junction block=yellow/windshield wiper motor connection
#17 bulkhead junction block=BLACK & WHITE STRIPE/windshield wiper motor connection
#18 bulkhead junction block=Green/water temp sending unit

http://i100.photobucket.com/albums/m...rra/schem1.jpg

http://i100.photobucket.com/albums/m...rra/schem2.jpg

http://i100.photobucket.com/albums/m...rra/schem6.jpg

http://i100.photobucket.com/albums/m...rra/schem5.jpg

http://i100.photobucket.com/albums/m...rra/schem4.jpg

http://i100.photobucket.com/albums/m...rra/schem3.jpg

Re: 1975 alternator and starter wiring
 

Thanks for the help guys. I'm off tomorrow so I'll see if I can get it figured out then. Thanks again guys
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