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> Electrical mods for a SIX conversion, Are any required?
Kerrys914
post Dec 20 2004, 09:02 AM
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Dear, the parts I just sold paid for that part ;)
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Getting the last few things ready to start the conversion and am curious about the electrical conversion.

What is needed to modify the stock '74 electrical system to work with the 911 engine. I assume the Fuel pump + lead will come from the engine bay realy board.

I have a crane ignition system (Hi-6, XR-700, and PS-91 coil).

Thanks.
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Root_Werks
post Dec 20 2004, 09:37 AM
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There are only a few simple mods you will have to make. The biggest one is the wiring off of the alternator. There are 4 leads that come off the back of the alt.

B+
D+
D-
DF

The B+ goes down to the starter (big bolt terminal)

The other three simply use the 914-4 volt reg and just mach them up. Now for the trick, you can pull off the volt reg on the 914-4 circut board to find out which one is which, when you do that, the terms are flipped on the other plug on the circut board. It is hard to explain without drawing a picture. I know I did somewere on my 914-6 thread, flip through it. Other than that, I think the fuel pump wires go dead because there is a sensor tied into the engine (type 4 FI) that kicked power to them. I used a different power lead.

The oil idoit light wire is green/grey I think?

You use/modify the 914-4 wirring harnes. Shorten a few wires, lengthen a few if needed sort of thing.

ANother tricky one is (if I remember right?? (IMG:http://www.914world.com/bbs2/html/emoticons/wacko.gif) ) the wires that go to the coil are both black, so test which one comes live for the coil + term, then the other one is for the tach.

Wirring is on this page:

http://www.914world.com/bbs2/index.php?act...2&t=15282&st=60
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Kerrys914
post Dec 20 2004, 11:00 AM
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Dear, the parts I just sold paid for that part ;)
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Thanks...
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Root_Werks
post Dec 20 2004, 11:42 AM
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(IMG:http://www.914world.com/bbs2/html/emoticons/boldblue.gif) No problem! I love it when a six comes together! (IMG:http://www.914world.com/bbs2/html/emoticons/boldblue.gif)
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IronHillRestorations
post Dec 20 2004, 12:35 PM
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The last three cars I did had internally regulated alternators, and the fuel pump was relocated up front so I removed the relay board, and make the 6 harness to connect right to the fourteen pin connector that plugs into the forward part of the chassis harness. Makes for a clean install. These were all carb'd engines though.
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Root_Werks
post Dec 20 2004, 12:39 PM
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Kerry's is a carb'd engine so this would be an option for sure. Little more work, but cleaner engine compartment.
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Series9
post Dec 20 2004, 03:17 PM
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Well, if you're using a Motronic FI, it's a little more complicated...


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Root_Werks
post Dec 20 2004, 03:24 PM
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(IMG:http://www.914world.com/bbs2/html/emoticons/drooley.gif) spagetti (IMG:http://www.914world.com/bbs2/html/emoticons/laugh.gif)
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sixnotfour
post Dec 20 2004, 03:29 PM
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If you keep the relay board just ground the terminal in the picture and your fuel pump will run stock relay/fuse. Good place for anti theft device too.

front left (outside) spade of 4 spade injection plugin.


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Dr Evil
post Dec 20 2004, 04:14 PM
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Hows about CIS? I can't wait. (IMG:http://www.914world.com/bbs2/html/emoticons/dry.gif)
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Joe Bob
post Dec 20 2004, 04:17 PM
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"I" jumpered the relay board and used the CIS fuel pump....
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Kerrys914
post Dec 20 2004, 06:25 PM
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Dear, the parts I just sold paid for that part ;)
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I like the idea of getting rid of the relay board. I guess I will look at the board diagram and see what I need to keep.

Should I cut the connecters off and solder/heat shrink the wires or ?

Cheers
Kerry
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IronHillRestorations
post Dec 20 2004, 10:07 PM
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QUOTE (Kerrys914 @ Dec 20 2004, 04:25 PM)
Should I cut the connecters off and solder/heat shrink the wires or ?

No, that would definately constitute a hack job! (IMG:http://www.914world.com/bbs2/html/emoticons/ohmy.gif)

You spend the $18 or whatever it is now and get the mating 14 pin connector.
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campbellcj
post Dec 20 2004, 10:08 PM
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My car still has the relay board as well, but I wouldn't mind getting rid of it since it doesn't do anything.

Definitely a good idea to move the fuel pump up front out of the heat and road hazards/dirt, since you're doing all the other major stuff anyway.
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Series9
post Dec 20 2004, 10:15 PM
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Sorry for the pre-dip condition of the engine bay.

Since my oil tank is in the front, I made this to replace my relay board. It's a breather box.

I'm a fan of removing the relay board if it's not needed because it's a breeding ground for electrical problems.


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Trekkor
post Dec 20 2004, 10:25 PM
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This is sooo cool. All these six-miesters trying to get it done. (IMG:http://www.914world.com/bbs2/html/emoticons/wink.gif)

I'll be following this one for sure...

KT
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Series9
post Dec 20 2004, 10:32 PM
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Oh man, here's a way better picture.

Isn't it neat without the relay board and all new wiring.


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Kerrys914
post Dec 21 2004, 09:58 AM
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Dear, the parts I just sold paid for that part ;)
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Don't want a hack job here (IMG:http://www.914world.com/bbs2/html/emoticons/ohmy.gif) I just figured it I make a clean hard soldered connection and re-wrap it that would be better then some sort of connector. The car is not going back to a 4 so there is no worries about putting the board back.

What are the details on this 14 pin connector (part number and photo)? Does it connect the 14 and 12 pin connectors together?

I was looking at the relay board wiring diagram and can see that the two pin connectors just need to be connected together. Is this correct?

I assume this 14 pin connector would just allow the two to just be connected.
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RON S.
post Dec 21 2004, 10:08 AM
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I took the route of buy a wiring harness from Patrick.
I describe to him what I wanted to accomplish,and they made the harness accordingly.
I had them make it so I did away with the relay board completely.
It was an easy plug-in deal.About 400.00 I think.
Came w/an interface for the tach & fuel pump.

Don't know if this helps,but it was a clean install for me.

Ron
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Root_Werks
post Dec 21 2004, 11:08 AM
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Getting rid of the relay board is something I have never done. I have always gone with "Touch as little as possible" when doing conversions. But wow, I sure like the thought of getting rid of all that mess over there! I might try it out on my own six this winter, just for fun. (IMG:http://www.914world.com/bbs2/html/emoticons/mueba.gif)
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