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Posted by: McMark Sep 6 2010, 10:38 PM

Who's got a picture of a 914/6 relay board stashed away? Please post.

Posted by: carr914 Sep 7 2010, 01:31 AM

My NOS front & back





And next to another with the same part # but with slight differences

Posted by: McMark Sep 7 2010, 01:46 AM

Cool! Thanks, that's exactly what I needed. There are no rear defrost connections.

Posted by: ArtechnikA Sep 7 2010, 05:37 AM

My Euro /6 had the rear defrost but I have no memory of how it was connected. I always thought it was through the relay board but I can't offer a reference for that impression.

Further, I was fairly convinced one of the relays (not otherwise needed on a /6) was the defrost relay. Could be the connection comes through the 14-pin multi connector. Now I'm veering into sheer speculation, and I'm not going to unroll my Art Zapf diagram this morning...

Posted by: 914Sixer Sep 7 2010, 05:42 AM

Rear window defrost is MADE into the factory six wiring harness.

Posted by: ArtechnikA Sep 7 2010, 05:46 AM

OK - elaborate please. Does it use one of the relays on the relay board, or is there another relay someplace else I've forgotten about? It gave me no trouble so I never had to go looking for it...

Posted by: Mark Henry Sep 7 2010, 08:35 AM

What are the differences between the /6 and /4 relay board? any difference in mounting?
I'll be doing a basic /6 with carb conversion and I do have rear defrost.

Posted by: carr914 Sep 7 2010, 08:43 AM

In the 3rd picture I posted, the used board is from my -6 and it has rear defrost

T.C.

Posted by: carr914 Sep 7 2010, 08:47 AM

Here is picture of another -6 Board ( where did I get all these?) and a -4 Board. The number of Pins from the Wire Loom are different.

I'm about to do another -6 Conversion, but I can't remember if I used a -6 Board on my last conversion or modified the loom and used a -4.

T.C.

Posted by: 9146986 Sep 7 2010, 09:23 AM

The 6'er board has a plug for the RPM transducer. It's at the bottom of the pic, directly across the board from the voltage regulator plug.

The RPM transducer was part of the idle pull down mechanism, and the MFI in 911's.

For a six conversion you can use the stock 4 relay board without any problem, or take it out (and the brackets) if you've moved your fuel pump up front, and wired it differently than stock.

If your conversion engine has an internally regulated alternator then you don't have to worry about the VR either. If you need the VR and want to pull the board, you can mount it on the rear bulkhead.

Posted by: Mark Henry Sep 7 2010, 10:09 AM

Is the voltage regulator the same on the /4 and /6?
(mine are both Bosch.)

Posted by: SLITS Sep 7 2010, 10:34 AM