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Someone must have noticed this before, but I did a search in the archives and turned up nothing. In the wiring diagrams for the 71 and 72 Chevelles (the only ones I've checked) there seems to be a lot of serious mistakes. The most glaring is the positive battery terminal with the starter wire and a ground wire attached to the same terminal. Further along, I have been comparing the actual wiring in my 72 with the diagram, and some more problems came up at the bulkhead connector, the PPL wire to the starter was not in the indicated location, and it goes on and on. How have people troubleshooted the wiring on these cars all these years with the mistakes? Was there a error correction sheet issued? If so, where can I get a copy?
Thanks

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Bob Walton
MCC #386
ACES #3158
Team Chevelle Gold #221
 

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I don't know! I just recently went through a 70SS wiring harness and found many serious mistakes. My 70 assy manual and another source both showed the same (and incorrect) diagrams. For instance on a 70 with no air a 20 amp fuse marked heat/ac is acutually going only to the tcs relay (why is it marked for heat and why would you want a 20amp fuse just to drive one relay) the busses on the back of the fuse panel are wrong also. I would have to post a pic to explain this one. I do know that the 71 and 72 bulkhead wiring are not the same at all. 70 and 71 are the same but 72 is different.

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Steve Strasemeier (70SS 396, Fathom Blue/White Stripes)
My 70SS
 

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Yes I noticed that also. There are several errors in the 72 diagram that I have. Like the TCS relay is under the dash but it’s not shown on the diagram. I have also noticed that on the dash harness diagram for 70/71 the forward lamp bulkhead connector is backwards while the engine harness portion is correct.

Just for the record while the 70 and 71 dash harnesses will interchange with each other there are differences. Like the 70 has a Heat (along with Dir and B/U) fuse and a Heat/AC – TCS fuse. If you don’t have AC then, as Steve pointed out, the top fuse supplies the TCS circuit only. On the 71 harness the top Heat/AC fuse supplies heat or heat/ac, the TCS is connected to the radio fuse. Also the cigar lighter ground connection is different between 70 and 71. The headlight and wiper switch grounding is also different.


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My ElCamino 1
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