Electric Windshield Washer Pump for 6v cars

Posted by JeromeSolberg On 2021/10/21 16:02:51
Hi Folks,

I tried and tried (tried rebuilding my old one, including repairing the cracked acrylic piston, bought another NOS one and put new rubber on it, etc.) but could never get my vacuum-operated Trico windshield washer pump to work reliably. It might squirt a few times, then it wouldn't.

So I finally decided to see what I could do otherwise. I tried a few options and finally settled on the following items:

1) A Universal Trico 12V replacement, which I purchased for ~$10 from Amazon. Trico Part# 11-100. I installed this on the same bracket I had installed my remote brake reservoir.

2) A 50A-rated starter-button which I installed in the passenger compartment using the same bolt that holds the radio bracket.

3) I ran a tube from the pump to the existing washer jar, I just ran the tube through the center hole where the vacuum connection had been.

4) I wired the pump into the battery using a 20A inline fuse, but didn't put that through the ignition switch. Since the button is spring-loaded, it ensures that operation is only intermittent, and only when the button is depressed. I had to make sure the polarity was correct so that the "negative side" was coming off the battery and the positive side was going to ground.

Even though the pump is 12V, it still works fine! Now I have reliable squirts to both the drivers and passenger sides - the previous owner had plugged the passenger side, probably because the vacuum-operated one worked so poorly.

As a bonus, my vacuum wipers now work much better! Plugging the outlet to the Washer Pump was the key to improving things, since that valve was/is probably leaky, and the whole washer pump mechanism itself was leaky as well.

The nice thing is, because this setup uses the existing washer bottle and cover, unmodified, and does not drill any additional holes, the car can be easily converted back to stock within minutes if so desired.

Attach file:

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jpg  50A_StarterButton.jpg (8.04 KB)
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jpg  20211021_134232.jpg (121.47 KB)
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