Originally Posted by throne7

Well, 1987 260E won't start after parked overnight. I turn the ignition and nothing. No lights no nothing. I drive another car up next to it and jumped started the 260E. So it starts up and I drive it for about half an hour on the highway. Came back to the parking lot and hooked up my trusty multimeter(voltmeter) and it shows only 11.75V At first I thought maybe it was a the battery or something draining the battery overnight. But seeing the 11.75V at the terminal of teh battery made me suspicious the alternator might be shot. One other thing, when I shift from reverse to forward and vice versa
the intensity of the headlights visibly drop a bit and comes back on. When I step on the brakes it also does this, sounds like the alternator doesnt it?


Is there a foolproof way to find out which is which? I have a spare brand new voltage regulator for the alternator but I am scare of pulling the old one out fearing that I might not be able to put in the new one and worse can't put back the old one. The regulator has two springy legs that you can push into the body of the thing, but hte pring will push it back out if I let go of the finger.

Is replacing the alternator a very tricky thing on this car? I looked at the engine compartment and I can see the voltage regulator bolted onto the alternator, and its accessable to my hands and screw driver. I wanted to get some opinions before putting the wrench to the thing. Is my diagnosis fairly close as far as altnerator is concerned or something else? Thanks in advance.