My '89 240 has the service, battery, parking brake, brake failure, & bulb failure lights lit up while running.
The battery light illuminates with the key on/engine off.
The alternator is not charging the battery, only 12 volts at the battery while running.
I've got a solid ground on the alternator, verified with a DVM.
I have 12.9 volts to B+ (thick red wire) but only 9 volts to D+ (thin red wire) with the key on/engine off.
It seems that D+ should be 12.9 volts but I don't know why the voltage is low.
Any ideas?
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