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Putting 1985 TPI/700r4 into a 1955 Chevrolet....using Painless harness and having a Stage 2 custom chip made for the '85 TPI. The harness has two wires for the brake switch, but the Painless instructions show a 4 terminal brake switch. Can anyone advise me on which brake switch to use...the 2 terminal (original to the '55) or 4 terminal per the instructions? Will the lock-up be controlled by the ECM?
Looks like they're using that for the lockup function. You do NOT want the lockup to remain on when the brakes are applied; the purple wire going to that other terminal must evidently go toward the lockup circuitry whatever that is.
Looks like they're using that for the lockup function. You do NOT want the lockup to remain on when the brakes are applied; the purple wire going to that other terminal must evidently go toward the lockup circuitry whatever that is.
If the harness doesn't have the wires for it, ... not much point.
Pretty sure you can get a BL sw out of any car in the same year time-frame that had cruise control. If of course your harness accommodates it. You haven't posted anywhere near enough info for us out here to definitively tell you one way or the other, unless somebody just happens to have done the same thing with the same harness at some point. But the total right answer is not on that page of the instructions. Unless the answer is in Paragraph 4.1.2.
If the harness doesn't have the wires for it, ... not much point.
Pretty sure you can get a BL sw out of any car in the same year time-frame that had cruise control. If of course your harness accommodates it. You haven't posted anywhere near enough info for us out here to definitively tell you one way or the other, unless somebody just happens to have done the same thing with the same harness at some point. But the total right answer is not on that page of the instructions. Unless the answer is in Paragraph 4.1.2.
Thanks for the response. I'll check with Painless for clarification.
The fact Painless still suggests a VSS is only necessary when you use lockup is pathetic. OEM-like drivability of a TPI system requires the VSS.
Use the 4-wire switch. I'm fairly use any 80s ECM / 700-R4 truck or car will have one. Make sure your harness wiring feeds the ECM so lockup can be managed by the ECM. A stock-lockup 700-R4 can have problems if left unlocked full-time.
