Wiper Gremlin

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Clafoun

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May 13, 2021
Posts
5
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Location
Texas
First Name
Charles
Truck Year
1985
Truck Model
1500
Engine Size
350
Strange little oddity on my 85… when running, anytime I slide the AC control to the off position my wipers cycle once and then park.. any thoughts?
 

gmbellew

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Location
Kansas city
First Name
glen
Truck Year
1990
Truck Model
suburban 1500
Engine Size
350
somewhere the ac wiring is touching the wiper wiring and giving it power? most likely two wires are touching without insulation somewhere....look at the wiring diagrams and loom locations and see where things get close....probably not until the firewall and could be on the engine bay side.
 

Clafoun

Junior Member
Joined
May 13, 2021
Posts
5
Reaction score
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Location
Texas
First Name
Charles
Truck Year
1985
Truck Model
1500
Engine Size
350
Thanks for the input… although that’s the first thing I tried.. even going so far as to running looms around both harnesses.. no such luck for an easy fix.
 

gmbellew

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Joined
May 27, 2018
Posts
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Location
Kansas city
First Name
glen
Truck Year
1990
Truck Model
suburban 1500
Engine Size
350
you may have to get a meter out and see if it is the hot or ground on the wipers getting energized when you move the switch. or you may be able to disconnect the wiper wiring at different locations and see if it stops the issue. that may help narrow it down.
 

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