68 FB 350 Need Help With Electric Problem
Good evening friends, my name is Mike. I own a couple of 68 Firebirds and one has just started having a problem I can't understand or fine. When I'm driving it at night (just started the last time out) everything works fine. But, when I go to turn on the heater fan, while my head lights are on. The car just dies without any warning. No hesitation, just going along and hit the fan switch and dead. This happens at any speed. Now, sometimes it didn't happen but about 80% of the time it will. However, shut off the lights, and the fan works fine. Battery is pretty new and a high end sealed Delco. Always kept on a battery tended plus when it's sat a long time or will sit. Headlights are normal replacements not halogen. The Alt was bought new about 2000 miles ago and I converted it to a single wire alt. Never had a problem until now.
I will mention one thing though. The door switches I found out oe was bad and it would not shut the lights off. So, I removed the fuse and the switches until I can replace them. Or rather I removed one end os the fuse to the door switches. Otherwise the interior lights would stay on.
I need to know how to check the output of a single Alt, and where else the problem may be? The battery was about $90.00 and a delco that has never given me a problem before.
Any ideas what may be the cause?? Thanks in advance, and good evening friends.