Rear Window Defogger Help

. There are 3 more wires under the seat that are cut too. I

Look at J9 on line three(3) there is supposed to be a relay there.

And there is more detail on my web site under Electrical/Misc/Window Defogger Speedy Jim

Blake,

Before you go through all that trouble, you may want to start by making sure your window grid is actually good ... in my case, it wasn't. I had open circuits all over the grid and for now have just decided to go with an external unit (blower / blower with heat) from JCWhitney. It's working fine until I'm ready to replace the back window.

Larry

...............It's too bad that more people don't try those small 12-volt fans for defrosting the rear window. Does your's actually have heat? My experience is that just a simple fan will clear the glass pretty quick. Does that heating element draw a lot of electrons away from more important duties?

Tim,

The defroster (available at JCWhitney) has a fan and a fan/heat switch (3 position). It's wired directly to the battery, and has its own inline fuse. I've noticed no adverse drain on the system ... as long as the motor's running.

Larry

I got this one from Napa. Using it on the windshield.

http://63.230.74.177/baja/page7.html Max

OK... I need a relay.... Where do I find one? Nobody appears to carry those. I've checked every VW parts place I could think of. Real Source, Aircooled.net, JC Whitney, cip1, oeveedub & btlmex. The only site I couldn't get into was Bughaus. I even checked Ebay. If anyone knows where I can get one please let me know.

Blake

Radio Shack Cat # 275-226 if you want it now.

Replying to my own message - You don't need a stock plug-n-play original, right? There are lots of alternatives if you are willing to fiddle a bit. High Amp is the clue.

I had one of those about five years ago, and it was ok, except I had to hold it up to the windshield while driving, cause it kept falling down from my "tape Job".............worked pretty well for me and I could pull it down and move it to the areas most needing the heat. Where there's a will there's a way.

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It's is not, it isn't ain't, and it's it's, not its, if you mean it is. If you don't, it's its. Then too, it's hers. It isn't her's. It isn't our's either. It's ours, and likewise yours and theirs. -- Oxford University Press, Edpress News

Hiya Blake,

Yes, you're going to need a high amp relay in order to make that window function. I have been quite successful in picking these up (used, of course) at VW swaps. I'm sure a VW online salvage yard (think Wayout Salvage) could round one up for you. You are looking for part number 311 963 141A.

Mike

1970 AS Bug

The switch on the dash supplies 12V to a relay under the LHS of the back seat. The other side of the relay coil goes to ground.

The relay contacts pass current from the battery to the LHS of the rear window.

The RHS of the rear window is grounded.

Before you get too far into this you should just check the resistance of the grid on the rear window. The resistive element on these is usually gone, even though it looks like it is there. It should measure about 5 Ohms. If it measures anywhere above 15 Ohms it won't be worth reconnecting. It is most likely that yours measures infinity.

Sorry, but that's just the way it is after 30 years.

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----------------------------------------------- Jim Adney snipped-for-privacy@vwtype3.org Madison, WI 53711 USA

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Our site was down for a bit this last weekend due to a server crash. It's back up now. Here is the link for that relay:

Regards, Eric