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245DL Weird Electrical Problems - Alternator, Voltage Regulator, Etc. 1987

posted by  B.B. on  Sat Sep 6 14:50 CST 2014
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last visit: Mon Oct 6 13:15 CST 2014
[RELATED]

What fuse blew?

Maybe no D+ to the alternator? It's generally run via the ignition switch.
If you can see the small wire to the alternator, maybe a #10 or 12ga,
see if you have battery voltage there. (Ignition switch in "Run" position)

You could run a jumper from the battery + to the D+ and see if your charge voltage returns, maybe 14VDC with the car running. Then get a new ignition switch, or put the D+ back on.... (just a hunch).

Good luck, Bill

In the 850 the ignition switch operates a relay 15 (Overload relay/X-15) that powers two fuses F2 and F3 plus provides the D+ for the alternator. I don't have a 245 schematic. It's possible that a relay might have crapped out.
Get a meter on D+ and find out if it's missing. Post back with a link
to the right schematic if you're still stuck.

A jumper might Rube Goldberg you for a temporary fix, but it could cause unknown
problems back feeding some short circuit that blew your fuse....risky!


BB






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