I've got a similar problem that I'm sorting out. While driving at night (headlights on, blower on) the "antilock" light comes on and all my lights get dim. When I turn off the blower everything goes back to normal. I just did my testing and the blower drops the volts by about 1.5 My blower has been making a lot of racket lately and it probably is the culprit. BTW, everything getting dim last week made me immediately suspect the alternator so I changed it. Next night I drove, same problem. Oh well, at least I have a new alt now. Let me know what your solution is to this problem. Is the blower motor able to be fixed, lubed, reconditioned? Thanks

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1985 300SD 241k "Woogie"