Help, Alternator Hook up for the /6, I thought I had it right! - ZAP, ZAP.. Options

[DougC]

I have a problem where I get a major spark when attaching the battery cables to the battery. Clay Perrine pointed out to me that it's the heavy RED wire that's attached to the Starter (same place as the battery cable) and runs up to the back of the alternator. Clay suggested that this red wire was hooked to the wrong post on the altenator. OK, I removed the complete CIS injection unit and peeled back the engine shoud. The wires were hooked up to the alternator like in Wayne Dempsy's book, the pictures I took upon disassembly were lost so I had to use the book for this. I'm using a newly rebuilt Marchall alt. with external regulator. Here's a breakdown of how I have it wired:

(posts are clockwise from the top)
"+G1" or "+61" = blue wire
"B+" = Red wires [one thick, one thinner]
"another B+" = short ground strap from engine case
"DF" = black wire with spade end
"D-" = 3 small brown wires
"D." = un-used

Where have I gone wrong?

Doug C

[Porsche Rescue]

That is identical to the Bosch alternator I have in my 2.7 conversion, wired to the 914-4 relay board using the external regulator on the relay board.
I think Doug's problem is the fact that he has a different alternator which is wired a bit differently.
The three terminal female connector which plugs into the 914-4 relay board is marked on the top side with D+, D- and DF. With the Bosch you just make sure the right wires are in the correct holes on the connector (they are D+ forward, DF rear and D- , side). You only need to switch them (swap D+ and DF) if you are not using the relay board but rather connecting direct to the male terminals on the bottom of the regulator.