Wiper gremlins
06-22-2020, 10:42 AM
#1
Senior Member
Thread Starter
Wiper gremlins
87 T/A with intermittent wipers.
Ive been having wiper issues for a while now.
car is LS1 swapped, the only wires at the c-100 are for the headlights, horn, and wipers. Everything else has been cut from the c-100 and routed behind the dash. Everything in the car works as it should.
the wipers go haywire in every setting on my switch and will not turn off unless I turn the key to off. And then they will usually park when I turn the key back on.
even the pump goes nuts.
I put a new stalk in, no fix.
I replaced the switch, no change.
pulled the cover, cleaned all contacts, the grounding points and re-soldered anything that looked iffy. No change.
with the connector undone to the motor, I get 12V on every wire all at once, when I turn the stalk to do anything.(except the yellow as that is power to the motor from the unplugged cover).
My understanding of this circuit is that each wire has a specific command, by memory: ppl is for high speed only, direct from the switch to the motor connector.
green is the park, so gets energized when switch is off, so no other wire should be showing 12v.
pink is for the washer motor, should only receive power when the lever for wash is turned.
and grey is for the intermittent and low speed.
So the fact I see +12 on all wires when I turn the switch is telling me it isnt the control board in the motor...
what should I be looking for next?
I'm going to pull the c-100 and see if cleaning it up does anything for me and test the leads right from there...
am I on the right train of thought for this?
Ive been having wiper issues for a while now.
car is LS1 swapped, the only wires at the c-100 are for the headlights, horn, and wipers. Everything else has been cut from the c-100 and routed behind the dash. Everything in the car works as it should.
the wipers go haywire in every setting on my switch and will not turn off unless I turn the key to off. And then they will usually park when I turn the key back on.
even the pump goes nuts.
I put a new stalk in, no fix.
I replaced the switch, no change.
pulled the cover, cleaned all contacts, the grounding points and re-soldered anything that looked iffy. No change.
with the connector undone to the motor, I get 12V on every wire all at once, when I turn the stalk to do anything.(except the yellow as that is power to the motor from the unplugged cover).
My understanding of this circuit is that each wire has a specific command, by memory: ppl is for high speed only, direct from the switch to the motor connector.
green is the park, so gets energized when switch is off, so no other wire should be showing 12v.
pink is for the washer motor, should only receive power when the lever for wash is turned.
and grey is for the intermittent and low speed.
So the fact I see +12 on all wires when I turn the switch is telling me it isnt the control board in the motor...
what should I be looking for next?
I'm going to pull the c-100 and see if cleaning it up does anything for me and test the leads right from there...
am I on the right train of thought for this?
06-22-2020, 04:18 PM
#2
Senior Member
Thread Starter
Re: Wiper gremlins
Fixed it.
I split the c-100 and put power right from the battery + to the corresponding terminals on the c-100 to send power to the individual circuits at the washer motor cover, and realized I had to clean each contact on the c-100 to get current flow.
so, took some maf cleaner, a toothbrush and some compressed air, cleaned it up and it works perfect.
and just for fun, I tested my old switch, for continuity and it is indeed one circuit live at a time (green when switch is off, purple on high, grey on low/pulse and pink for the washer). That was $150 wasted but now I have a spare part for when this goes out in another 30 years.
I split the c-100 and put power right from the battery + to the corresponding terminals on the c-100 to send power to the individual circuits at the washer motor cover, and realized I had to clean each contact on the c-100 to get current flow.
so, took some maf cleaner, a toothbrush and some compressed air, cleaned it up and it works perfect.
and just for fun, I tested my old switch, for continuity and it is indeed one circuit live at a time (green when switch is off, purple on high, grey on low/pulse and pink for the washer). That was $150 wasted but now I have a spare part for when this goes out in another 30 years.
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