914 6 conversion wiring...

[Mike D.]

In going through the wiring for my '73 conv. I thought I had everything figured out. But now I am questioning the voltage regulator wiring...

Is the voltage regulator built in to alternator or will I be using the old 914-4 regulator?

Coming out of the fan shroud behind alt. is extra blue wire that, I believe, goes to the alt. light. However, when I look at the 911 wire diagram that blue wire is coming from the volt. reg.

the wires come to the pin connector, at first I thought I would cut and add conectors and plug them into the relay board where the old 4 alt. plugged in, but now I'm not sure...

Can anyone with a conv. car tell me where the alt. wires plug into the relay.

TIA,
Mike D.

[Dave at Pelican Parts]

Early 911s had an external voltage regulator. Later ones had the VR internal to the alternator. If yours is internal (blue wire makes it sound likely), then you don't hook an external regulator to it.

--DD

[Mike D.]

my engine is 1970 2.2E. In looking at the digrams here on PP I belive the regulator is in the alt.

SO, I should plug the alt. wires into the stock location but remove the 4 cyl. regulator and put in a couple of jumper wires, si?

-Mike D.

[scg]

Check the alternator to be sure.

If it's internal to the alternator, why keep the relay board at all?

[Mike D.]

Don't I need the relay board to get signals to and from the main body harness? Oil pressure, power to the coil, signal to the starter, revers lights etc.

-Mike D.

[Dave at Pelican Parts]

If I recall correctly, the alternator with the internal regulator needs three connections. First, the outside needs to be grounded. The mounting usually takes care of that.

Next, the blue wire needs to be hooked up to the alternator light circuit. (There's a good chance the alternator won't charge at all without the light there!!)

Finally, there's the big thick charging wire that should hook up to the starter.

And that's it.

Check to see how many wires come out of the alternator. If it's just two, I think they hook up as mentioned above.

--DD

[Mike D.]

OK, I've got FIVE wires coming from the shroud behind the Alt.
Thicker Red to Starter
red - D+
black - DF
brown - D-
Blue - as you say above - Alt. light in dash.

I should look at that 911 diagram again...

-Mike D.

[boxstr]

Mike I f you will check with Leamon on a pair of 8x16 Fuchs that he said he may have, I have called and no return. I will go out and take pics and notes on my 74 914-6 conversion.
Craig C. Laughlin CAMP 914

[scg]

I used the 911 engine wiring harness (14-pins) and wired it to the (14-pin) 914 harness to eliminate the relay board. I intended to do a really neat job of it (still do, just put it off 'till this winter) using two 14-pin "kits" from the dealer (see 14 pin connector - replacement pins? for the part # and picture).

Since I had the car apart, I took the time to run a nice fat power wire from the battery to the front trunk, along with two extra wires: one for the signal that the ignition was on to a set of relays in the front trunk (lights and fuel pump), and one to the center console for oil pressure -- I already had the oil temp and entertaining voltmeter wires since the car was wired for a center console (I think they all are, with only a harness needed to go from the central tunnel to the guages themselves, aren't they?).

As far as hooking up the alternator with internal regulator, the Porsche technical bulletin in this thread (How to hook up an alternator?? 81 911SC ) mad it super easy.

Check everything twice before you hook it up to the battery, though: it's really tough to get the magic smoke back in once it's out

And don't forget that all power lines should run through a fuse!

If you like, I can send you my wiring pin-outs from my notebook, too.

[Mike D.]

Craig - I'll call Leamon and find out what's going on with fuchs.

Scott thank for the links - now I have more reading to do...

I let everyone know what I find out...

-Mike d.

[Dave at Pelican Parts]

Mike, with those wires I think you have an externally-regulated alternator. Hook the red, brown, and black up to a voltage regulator. Hook the blue up to the warning light circuit. The thick red, as you said, goes to the starter.

--DD

[Mike D.]

Thanks Dave, that is exactly the answer I was looking for...
-Mike D.

[Mike D.]

I was just looking at the wire diagrams for early 911 and they have the blue wire as coming from the D+ of the alt. -

Just when I think I've got it figured out...

Is it safe to use a volt meter on the Alt. wires while the engine is running?

-Mike D.

[Dave at Pelican Parts]

The blue and (I think it's) red come out of the same thing. Check the diagrams. (Do that regardless; don't burn up your alternator because I slipped up and misremembered something, please!!!!)

--DD

[Mike D.]

The 911 wire diragram here on PP says that the two reds are B+
blue is D+, Brown is D- and black is DF, (what ever that means).

Does anyone know if it's safe to check the wires while the engine in running?

-Mike D.