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Posted by: sixaddict Dec 13 2022, 04:47 PM

Here’s an easy one

When converting a 4 to a 6 is it necessary to use six relay board.
Thanks

Posted by: mepstein Dec 13 2022, 05:04 PM

Nope

Actually it’s not always necessary to use one at all.

Posted by: sixaddict Dec 13 2022, 05:15 PM

Thanks Mark

Posted by: JmuRiz Dec 13 2022, 09:24 PM

I think Perry still does custom harnesses for whatever board or no-board you want to run:

http://www.914world.com/bbs2/index.php?showtopic=24228

Still on my to-buy list

Posted by: SirAndy Dec 13 2022, 09:51 PM

I removed mine completely and used a PMS adapter harness which plugs in directly to the /4 main chassis harness and goes to the /6 engine.

Posted by: mepstein Dec 13 2022, 11:22 PM

Did the same on my 3.2. Easy peasy.

Posted by: Retroracer Dec 13 2022, 11:45 PM

Another option is to retain the -4 relay board / cover, if you're after more of an original look and you're swapping in a period correct 6 (requiring an external voltage regulator). Just need an engine harness to match up to the connector.

- Tony

Posted by: mlindner Dec 14 2022, 05:26 AM

Not only does Perry build a great engine harness, he also explains it well. Plug and play.

Posted by: dr914@autoatlanta.com Dec 14 2022, 09:29 AM

no not at all and very very cost prohibitive.


I in my pamphlet 914-6 conversion guide or "what you are getting yourself into" have the wiring harness diagrams showing how to use the four board with a six engine

Posted by: Steve Dec 15 2022, 09:03 PM

Typically not needed with a six and I removed mine.
From what I remember, what's on the board?
1. Fuel pump connection. With my 2.7 it was easier to wire up a separate fuse for the fuel pump. 3.2 and 3.6 fuel injection have separate connections for this anyway.
2. Heater fan relay. Not needed with a six conversion
3. Regulator. Most sixes already have a built in regulator
4. 914-4 Fuel injection. Not needed
5. ? Rear window defogger. Does yours have one? Either keep the board or rewire it.

Posted by: Root_Werks Dec 16 2022, 10:26 AM

Similar on mine, removed the relay board and brackets. Makes it nicer to access oil tank stuff.