Re: M electrical problem

Posted by Janicholson on September 12, 2005 at 06:45:03 from (199.17.6.175):

In Reply to: Re: M electrical problem posted by old on September 11, 2005 at 15:26:36:

The short, mentioned by Old, may be the alternator diodes. If they went bad, or the main (big) terminal is ahorted to ground, the wire will smoke. Check as follows:
Disconnect battery (one terminal will do, and move it so it can't accidently go back and touch the post).
Disconnect the alternator Big terminal. use an ohm meter set on RX1 and check between alternator frame (shiny spot), and the big terminal on the alt. (not the wire). If there is no resistance (the meter reads nearly zero) the diodes are toast or the wires are shorted.
I always use a fusable link (available from NAPA or others) that is rated at 5 amps more than the alternator. The fusable link should be exposed to air (not taped up in a loom) and connected inline in the wire going from the amp meter to the battery cable. This prevents smoke!!!
The amp meter must be rated for more current than the alternator can make!! Max reading of 50+ for a 45 amp alt.
Good hunting, let the forum know the outcome.
JimN

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