windshield wipers wont turn on - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**hatzie** · 01-21-2020, 06:45 PM

The only difference in the 85 & later civilian wiper motors is the lack of the gear and cam washer pump and the plug for it.
The 1985 and newer civilian trucks had the washer pump in the washer fluid reserviour and the wires that were routed to the pump terminals on the wiper motor on earlier models were routed to the tank mounted pump instead.

You should still have the three wire plug with ignition power in the centre position and HI & LO grounds from the switch on the outside terminals.

Again my knee jerk thought is one or more of the electrolytic motor noise suppression capacitors have kicked the bucket. Not terribly shocking after 30+ years. The civilian versions of these trucks did not have them. These capacitors were a CUCV specific electrical part like the starter relay behind the knee panel. They can be bypassed with no ill effects.

01-21-2020, 06:45 PM	#16
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 5,049	Re: windshield wipers wont turn on The only difference in the 85 & later civilian wiper motors is the lack of the gear and cam washer pump and the plug for it. The 1985 and newer civilian trucks had the washer pump in the washer fluid reserviour and the wires that were routed to the pump terminals on the wiper motor on earlier models were routed to the tank mounted pump instead. You should still have the three wire plug with ignition power in the centre position and HI & LO grounds from the switch on the outside terminals. Again my knee jerk thought is one or more of the electrolytic motor noise suppression capacitors have kicked the bucket. Not terribly shocking after 30+ years. The civilian versions of these trucks did not have them. These capacitors were a CUCV specific electrical part like the starter relay behind the knee panel. They can be bypassed with no ill effects. __________________ 1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials... 1973-1991 GM Light Truck Service, Unit/Overhaul, Wiring Manuals, Parts Books and Some 1968-1999 GM Service Training textbooks in PDF 1988-1998 GMT400 CK service manual project 1988-1993 GMT400 CK parts books. 1967-1972 GM Light, Medium, & Heavy Truck Service Manuals in PDF Please include at least the year and model in your threads. It'll be easier to answer your questions. And please let us know if and how your repairs were successful.



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