Re: LT1 in 69 camaro
I'm not familiar with the LT1 harness, but if it's anything like the 99-02 LS1 harness (in concept, at least), I'd do something like this...
1) Leave everything connected to the engine/trans/PCM as they were in the '96.
2) take inventory of all the connectors that aren't hooked up to anything (ie, used to go to the body harness, fuse block, etc). Write down a description of each of those connectors, and list out each pin (the pins may be identified with a letter if they are like the newer ones) and the color of wire going to it
3) Sit down with the '96 wiring diagrams and figure out what connector number each one of those is, and what each pin is supposed to hook up to on the '96, and write it down next to each pin as listed out in step 2.
4) Go through your list pin by pin and figure out whether it's something you need to keep or not. It's OK to put down some "maybes".
5) For the stuff that you are keeping, figure out what it needs to connect to on the '68 harness. Generally that's going to be BAT, RUN, tach, speedo, checkengine light, etc.
6) Add relays for the RUN, fuel pump, and fan circuits as needed. List out all of the relays you are going to use, and then list out each pin on the relay. Fill in the blanks for each pin, one pin at a time. Some of the pins will connect to the engine harness. For those, you should go back up the you engine harness connector list and add notes for those pins saying something like " - to pin 86 of Relay RUN2".
7) Go back up to the top of your list and start connecting wires, one pin at a time. Once you've checked off every pin on all of the connectors and all of the relays, you should be done.
I spent a lot of nights researching wiring for my LS1 swap and pulling my hair out until I finally sat down and went through it pin-by-pin one pin at a time for the body & interior connectors. No need to worry about the individual sensor connectors and PCM connectors--those are all either hooked up, or gettin eliminated, and either way don't need to touch them until you are ready to do a cleanup on the harness. There's nothing complex about hooking up 1 wire... you just have to do that 30 or 40 times or so.
7) Go back to the top
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