Attention Electrical Gurus, Need help with windshield washer wiring |
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Attention Electrical Gurus, Need help with windshield washer wiring |
bbrock |
Jul 28 2022, 07:17 PM
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#1
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914 Guru Group: Members Posts: 5,269 Joined: 17-February 17 From: Montana Member No.: 20,845 Region Association: Rocky Mountains |
Right after ordering a complete Car Magic kit to convert my windshield washer to electric, I read Sir Andy's excellent tech article on the conversion. The idea of pulling power for the washer pump off the intermittent wiper feed so the washer is activated by pulling back on the wiper lever was too elegant not to try.
I happened to have this nifty vintage VW style splitter I bought some time ago for not other reason than I thought it might come in handy for some future custom wiring project. It was just the ticket for splitting off of my intermittent washer relay to power the washer pump. After hooking everything up, I pulled back on the wiper lever and HUZZAH! The washers squirted and the wipers ran for two sweeps and parked. Pretty slick! I couldn't understand how the intermittent wipers would work when the lever was pulled down to turn the intermittent wipers on. I pull down on the lever to test them and nothing. As soon as I unplug the washer pump, the intermittent wipers start running. I'm not sure how the intermittent relay works, but thinking the timer is from charging a capacitor which then "bump starts" the wipers to run a single cycle. Is there is a reasonably simple way to isolate the pump so it allows the intermittent mechanism to run without activating the washer pump? Could be a fun project. Or should I just go back to the original plan of installing the Car Magic switch? I just like the idea of minimizing the wiring. |
bbrock |
Aug 6 2022, 02:26 PM
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#2
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914 Guru Group: Members Posts: 5,269 Joined: 17-February 17 From: Montana Member No.: 20,845 Region Association: Rocky Mountains |
Unbelievable! The diodes arrived yesterday. I wound up ordering these from Mouser because Digikey's system was screwed up and wouldn't let me add the other diodes to my cart.
My plan was to do a quick test to make sure they worked, solder them into the wire, and be done with this project. So I twisted the diodes into the wire and pulled back on the wiper lever and yep, the washer pump ran although I could see it was spraying weaker than it had been. Pulled the lever down and the intermittent wipers ran. Looked good. Moved the lever back to the off position and pulled back on the lever again. Nothing. (IMG:style_emoticons/default/WTF.gif) Pulled one of the diodes out to see if just one would work. Nope. No washer, but intermittents worked. Broke out the DMM to start trouble shooting. I was getting 11.9v at the pump end of the wire with lever pulled back. Pulled the pump out and hooked it up to my power supply set to 12v. Nothing. The motor runs when disconnected from the pump. It struggles but runs when the motor shaft is inserted through the rubber seal in the pump, and chokes when brass gear is on the shaft even if the other gear is missing. Couldn't get the motor out without breaking the housing so that's as far as I went. I'm just assuming the pump puts too much load on a cheap-ass motor. Anyway, the testing with the DMM showed that the 2 diodes wired in series will work, so I went ahead and soldered up the pump power wire. I have a VDO pump on order so will have to wait for that before I can finish this up. |
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