Wiper wiring issues

Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.

cbpercy06

Junior Member
Joined
Aug 12, 2024
Posts
5
Reaction score
10
Location
Maine
First Name
Calvin
Truck Year
1987
Truck Model
V1500
Engine Size
327
Hey there y'all,

My wipers stopped working recently on my '87. My first guess was that the motor had gone bad; they stopped working one day, then worked for about 10 minutes the next morning before quitting for good. I replaced the motor, no dice. My guess is that I've lost power to the switch (I had the same issue with my headlights, I think the wiring from the starter to the firewall is bad). I've had trouble finding diagrams, does anyone know which wire on the firewall is power to the wiper switch? Thanks.
 

Attachments

  • 20240812_194824.jpg
    20240812_194824.jpg
    148.3 KB · Views: 21

Jgonick

Full Access Member
Joined
Jan 12, 2017
Posts
263
Reaction score
339
Location
West Texas
First Name
Joel
Truck Year
1985
Truck Model
K10
Engine Size
350
WHT-93 power from fuse box.
WHT-93 supplies current to wiper motor & washer motor. Wipers work by being grounded by one of the other wires by the wiper switch.
The wiper switch itself is grounded by BLK-150 which goes to ground bus on driver side kick panel. It's located behind lower AC vent by e-brake

PNK-94 ground -washer
PPL-92 ground -fast
GRAY-91 ground-slow
BLK/LT BLU-97 grounds GRAY-91 (slow) until park switch opens at end of cycle,
BLK-150 ground
 

Attachments

  • 87.png
    87.png
    173.7 KB · Views: 29
  • 20240812_194824.jpg
    20240812_194824.jpg
    221 KB · Views: 22
Last edited:

cbpercy06

Junior Member
Joined
Aug 12, 2024
Posts
5
Reaction score
10
Location
Maine
First Name
Calvin
Truck Year
1987
Truck Model
V1500
Engine Size
327
WHT-93 power from fuse box.
WHT-93 supplies current to wiper motor & washer motor. Wipers work by being grounded by one of the other wires by the wiper switch.
The wiper switch itself is grounded by BLK-150 which goes to ground bus on driver side kick panel. It's located behind lower AC vent by e-brake

PNK-94 ground -washer
PPL-92 ground -fast
GRAY-91 ground-slow
BLK/LT BLU-97 grounds GRAY-91 (slow) until park switch opens at end of cycle,
BLK-150 ground
Thank you much! Hopefully I'll get it working tomorrow
 

Forum statistics

Threads
43,515
Posts
937,069
Members
35,397
Latest member
sqrbdy
Top