Washer Motor Wiring Help? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Dodge68charger · 03-07-2025, 11:00 PM

I’d like to put an aftermarket washer fluid motor in my 1969 c10. Previous owner has an aftermarket reservoir in the engine bay but no pump.

How would i wire an aftermarket pump to the push button switch on the dash?

Thank You

ray_mcavoy · 03-07-2025, 11:13 PM

There should be two wires going to the electric solenoid that engages the existing mechanical pump mounted on the motor. Typically yellow and dark blue.

Locate those two wires, unplug them from the old washer pump, and splice or plug some extension wires into them.

Run those extension wires out to your new pump. The new pump is likely polarity sensitive. The existing yellow wire is +12V and the existing dark blue wire is a switched ground (gets grounded to complete the circuit when you push the washer button).

**MikeB** · 03-08-2025, 06:21 PM

This may help. Found it on the American Autowire schematic for their Classic Update harness:

WIPER SWITCH
Black Low speed ground
Light Blue High speed ground
Dark Blue Washer pump ground

They don't show yellow, but as Ray said, it's 12 volts, either ignition or accessory.

Details here:https://api.americanautowire.com/sho...Design%202.pdf

ray_mcavoy · 03-08-2025, 06:42 PM

Quote:

Originally Posted by MikeB

They don't show yellow, but as Ray said, it's 12 volts, either ignition or accessory.

Yeah, the yellow power feed wire doesn't go to the switch ... just to the motor & pump.

**MikeB** · 03-08-2025, 06:48 PM

Quote:

Originally Posted by ray_mcavoy

Yeah, the yellow power feed wire doesn't go to the switch ... just to the motor & pump.

OK, that explains it.

RustyPile · 03-08-2025, 08:13 PM

Quote:

Originally Posted by ray_mcavoy

There should be two wires going to the electric solenoid that engages the existing mechanical pump mounted on the motor. Typically yellow and dark blue.

Locate those two wires, unplug them from the old washer pump, and splice or plug some extension wires into them.

Run those extension wires out to your new pump. The new pump is likely polarity sensitive. The existing yellow wire is +12V and the existing dark blue wire is a switched ground (gets grounded to complete the circuit when you push the washer button).

This is how I connected my external washer pump.. I left the original factory plug in place and just added wires to connect to the pump.. I passed the wires through the grommet where the original water hoses passed through the firewall into the engine compartment. I also use matching color coded wires. The added feature of this modification is water for the pump is no longer routed into the cab interior...

Dodge68charger · 03-09-2025, 03:20 AM

Thanks Guys. Appreciate The Help

03-07-2025, 11:00 PM	#1
Dodge68charger Registered User Join Date: Jul 2014 Location: Washington Posts: 547	Washer Motor Wiring Help? I’d like to put an aftermarket washer fluid motor in my 1969 c10. Previous owner has an aftermarket reservoir in the engine bay but no pump. How would i wire an aftermarket pump to the push button switch on the dash? Thank You Attached Images

03-07-2025, 11:13 PM	#2
ray_mcavoy Registered User Join Date: Nov 2009 Location: Sherman, ME Posts: 2,373	Re: Washer Motor Wiring Help? There should be two wires going to the electric solenoid that engages the existing mechanical pump mounted on the motor. Typically yellow and dark blue. Locate those two wires, unplug them from the old washer pump, and splice or plug some extension wires into them. Run those extension wires out to your new pump. The new pump is likely polarity sensitive. The existing yellow wire is +12V and the existing dark blue wire is a switched ground (gets grounded to complete the circuit when you push the washer button).

03-08-2025, 06:21 PM	#3
MikeB Senior Member Join Date: Jul 2000 Location: North Texas Posts: 3,663	Re: Washer Motor Wiring Help? This may help. Found it on the American Autowire schematic for their Classic Update harness: WIPER SWITCH Black Low speed ground Light Blue High speed ground Dark Blue Washer pump ground They don't show yellow, but as Ray said, it's 12 volts, either ignition or accessory. Details here:https://api.americanautowire.com/sho...Design%202.pdf __________________ Mike 1969 C10 LWB -- owned for 36 years. 350/TH350, 3.08 posi, 1st Gen Vintage Air, recent AAW wiring harness, 5-lug conversion, 1985 spindles and brakes. 1982 C10 SWB -- converted from 250-six to roller cam 350, Vortec heads -- sold 1981 C10 Silverado LWB, 305, TH350C -- sold, but wish I still had it! 1969 C10 (not the current one) that I bought in the early 1980s. Paid $1200; sold for $1500 a few years later. Just a hint at the appreciation that was coming. Retired as a factory automation products salesman. Worked part-time over the years for an engine builder and a classic car repair shop. Member here for 24 years! This is the very first car/truck Internet forum I joined. I still used a dial-up modem back then!

03-09-2025, 03:20 AM	#7
Dodge68charger Registered User Join Date: Jul 2014 Location: Washington Posts: 547	Re: Washer Motor Wiring Help? Thanks Guys. Appreciate The Help



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