Ok. Here's one for you. 91 n/a bridgeport coupe. carb swap using racing beat intake/holley 600. no ecu. unknown condition on body control computers/body harness as the car is still new to me.

Idling cold, the car will die occasionally (right foot keeps it alive but I'm not perfect). This is (probably) due to the carb needing rebuilt. Also, generally, bridgeports don't idle worth a damn when cold.

The problem: In the split second as the car dies (200-0rpm) the windshield wipers come on. I am aware that the switch is faulty as it only works on one speed (standard bad relay), but has no problems performing its usual one-speed-wonder under normal running conditions.

I'm assuming this will have something to do with wiring to the ignition switch but am otherwise stumped as to why it would be wired this way and why it only happens as the car dies.

Any ideas or input would be appreciated. Note that I cannot check anything on the car until this weekend due to it being stored in a garage 60 miles away. Depending on my time this weekend, I will check out as much body harness as I can and I may also remove all the excess wiring in the engine bay (90% of the engine harness is unused and coiled up into one corner)

Thanks in advance for any help received.

 

Wipers work by the switch putting a GROUND on either the blue/white or blue/red wire at the wiper motor.

I'd suspect that the wiring is butchered somewhere near the ORANGE plug in the passengers foot well. The ORANGE plug with fifteen pins/sockects called FEM-01 on the wiring diagrams.

When you put the key to ON, that act power up the fuses on IG2 in the interior fuse box. The wiper fuse is on that bank of fuses. HOLDING the key to START removes the power to the IG2 bank of fuses. Then letting the key return to ON from START puts power back on that bank of fuses on IG2.

In other words wipers don't work unless the key is to ON. Sometimes wipers won't work if there are too many keys on the ignition switch which in turn does not allow the key to fully return to ON thereby disableing the IG2 fuses.

But your problem seems to lie in SOMETHING putting a gnd on either the blue/red or blue white wires on the wiper motor. I assumed the wiper switch was to OFF when this happens.

It's too hard to fix from here. The CLUE is that the wiper motor works when a ground is put on either of the two wires mentioned above.