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-   -   Rear defrost switch rating? (http://forums.pelicanparts.com/porsche-924-944-968-technical-forum/1006567-rear-defrost-switch-rating.html)

DaddyGlenn 08-31-2018 06:36 PM

Rear defrost switch rating?
 
I am thinking about re-purposing the rear window defroster switch in my 1985.1 944 track car. If it can handle it, I will use it to direct wire the radiator fans.

Does anyone know how much amperage this guy can handle?
http://forums.pelicanparts.com/uploa...1535765772.jpg

drkshdw 08-31-2018 06:41 PM

How many amps is the fuse that switch is on? I would assume that's how much it can handle.

DaddyGlenn 08-31-2018 06:59 PM

Quote:

Originally Posted by drkshdw (Post 10164135)
How many amps is the fuse that switch is on? I would assume that's how much it can handle.

Calling me out for being lazy, huh? I see how it is. Just kidding. SmileWavy

Really that is a no-brainer. I should have thought of that, but didn't. Thank you. And now that you suggest it ... the wiring diagrams say 8 amps, which is too little. I need at least 25. But, hey, the relay is 25 amps. So I could relocate the relay and use that to carry the load of the fans.

I'll have to see how much work that would be.

drkshdw 08-31-2018 07:41 PM

:D HAHA!!! Sometimes the most obvious isn't the most obvious at the time. ;)

Now as far as running the fans through the relay, I have no idea how you'd go about doing that. There are plenty of racers that direct wire the fans but I don't know how or where they get power or control them. Perhaps a search in the turbo forum would yield some more clues than just here.

DaddyGlenn 09-02-2018 06:46 AM

I did do my research for how to direct wire the fans. It seems the popular method is to run a wire from the ground wire for each fan to a switch and then ground. I am looking for a more elegant solution. I've located where I can tap into existing wiring under the dash. Just need a good switch or switch/relay solution.

http://forums.pelicanparts.com/uploa...1535895974.jpg

Pauld_94S2 09-02-2018 07:39 AM

Use a relay, it's easier and safer.

Then you can use any switch on the dash you want.


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