914-6 Gen light comes on when hooking up the battery. Options

[Porscheman912]

Ok, I have a friends 914-6 here, and just built the engine in it. Before doing the engine, and after, the Gen light comes on when the car is off. I took the starter, and Alt to a shop to have checked out, and they were both good. Replace the Volt reg with another new one I had, and still on. I have a wiring diagram, but does not show wire colors, or switches. The light would go out in 2nd position on the ignition switch, and then come back on. I dropped the fuse panel down, and now it is on in all positions. It goes out when started. I was getting a very light arc when I hooked the battery up, but when I unplug the alt plug from relay board it goes out. I am thinking it may be the ignition switch itself, and just wondering if anyone has seen this on these cars? It is an OEM 6, not a conversion. Any help would be great, I need to get the owner his car back, and I am still testing things, just trying to save time if someone else has seen this.

[Porscheman912]

Yes, when I pull the three wire plug from the Alt to the relay board off, the light goes off. I checked all three wires when I had everything hooked up, and car off, and they were all hot. The guy who went through the alt had told me he found a bad diode, and replaced it, but I talked to 2 people who said the same thing you did. I have chased everything down on this, even fixed the 4 ways, which I found out had not worked in years, just so I could eliminate things, and it all came back to the alt. Thank you very much for your help, now the fun part is getting the alt out.