ready to pull what's left of my hair out ! Can anyone think of WHY terminal "M" of the 203 plug in my 87 GT would be "HOT" instead of ground ??? Isn't "M" supposed to be ground ? ( This is checking with the 203 Plug "Unplugged") Thanks

Not any more help from me than this chart. Maybe it's get voltage from L or N due to a short but I don't know. I just found this in the archives.

I would say that if it is not grounded on the other end that it floats high. If you have it unplugged thay may be the reason it shows voltage on it, you need to have all the grounds in place for voltage readings to be valid. Larry

quote Originally posted by trotterlg: I would say that if it is not grounded on the other end that it floats high. If you have it unplugged thay may be the reason it shows voltage on it, you need to have all the grounds in place for voltage readings to be valid. Larry

This is the correct answer to your question. If a circuit is not complete the hot will just pass through.

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86 Fiero GT 4spd - L67 swap: VS cam, GenV
98 GTP - Some mods

Do you have continuity to ground on the drivetrain half (white) of the C203M circuit?

Phonedawgs supplied a Diagram that "I think" should work for me. ( Diagrams work for me, "Testing" with the multi meter I'm not so "Sure" of if I'm doing it correctly. I AM retaining the" original "3 prong oil pressure sender. I was just afraid of hooking 203 "M" to ground when it is coming up "HOT", didn't want to fry my new harness ! Thanks to all, hope this will finish it.

Wow, that's a lot of " in one post

quote Originally posted by Lou6t4gto: Phonedawgs supplied a Diagram that "I think" should work for me. ( Diagrams work for me, "Testing" with the multi meter I'm not so "Sure" of if I'm doing it correctly. I AM retaining the" original "3 prong oil pressure sender. I was just afraid of hooking 203 "M" to ground when it is coming up "HOT", didn't want to fry my new harness ! Thanks to all, hope this will finish it.

I don't think there is a problem, if you are really concerned you can touch that pin to a ground through a 5 amp fuse, if its wrong it will pop the fuse before frying any wiring.

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86 Fiero GT 4spd - L67 swap: VS cam, GenV
98 GTP - Some mods

well, that Seems to have done it ! it didn't fry anything and the fuel pump now initializes. Now the 1 last thing (or 2) . I need to install the "correct" fuel pump, and find out why the pressure goes to 55 then drops. But, hey, IT RUNS !

quote Originally posted by Lou6t4gto: well, that Seems to have done it ! it didn't fry anything and the fuel pump now initializes. Now the 1 last thing (or 2) . I need to install the "correct" fuel pump, and find out why the pressure goes to 55 then drops. But, hey, IT RUNS !

makesure to replace the piece of hose inside the tank with the RIGHT kind of hose, it needs a piece of special submersible fuel hose.
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