Attention Electrical Gurus, Need help with windshield washer wiring Options

[bbrock]

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.

[Superhawk996]

just saw your other post

Yes - the schematics are a bit ambiguous where lines are crossing.

My understanding of how Porsche does them is that if lines cross and there is no dot (usually a solid dot) there is no connection.

At wire ends there is often a empty (hollow) dot indicating a connection point.

[bbrock]

just saw your other post

Yes - the schematics are a bit ambiguous where lines are crossing.

My understanding of how Porsche does them is that if lines cross and there is no dot (usually a solid dot) there is no connection.

At wire ends there is often a empty (hollow) dot indicating a connection point.

You are right. I've been reading it wrong and it makes even more sense now but doesn't change the diagnosis. Reading it correctly, 53 only gets 12v when in position "1" which is low speed. That makes perfect sense now.

I still say that the only wire we really need to be worried about is brwn/blk which is the only one modded by adding the pump, but it's fun to know how the complete circuit works.