1990 Ranger alternator

Sometimes charges, sometimes not. Possible cause ?

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need new ECM.....ECM ground failure
<DIV><FONT size=2>Sometimes charges, sometimes not.&nbsp; Possible cause ?</FONT></DIV></BLOCKQUOTE></BODY></HTML>
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On Mon, 28 Jul 2008 18:09:56 -0700, "Rick Cooper"
If the ranger is the same as the aerostar (in most respects it is) the regulator is in the alternator, not in the PCM. However, I have had some experience with the Aerostar where new brushes and new regulator still netted an intermittent charge - so I had to replace the entire alternator.
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"Ray Fehrenbacher" wrote:

Worn brushes. Bad regulator. Loose connections. Bad ignition switch.
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On Mon, 28 Jul 2008 14:15:57 -0500, "Ray Fehrenbacher"
First, turn off the MIME - Usenet News is a plain-text medium.
The first thing you check on an alternator that is starting to go intermittent is worn slip-ring brushes. If you can't get the field current to the rotor, you won't get any output power.
If you are handy, you can replace them yourself. A set of brushes will cost you under $10 at any good parts counter, a bit more if you get the whole holder with the brushes pre-assembled.
Or spend about $75 and take the unit in to a good local auto electric rebuilding shop. They will change the brushes on your old alternator, clean it out, lube or change the bearings as needed, and check for other problems like bad diodes or windings.
--<< Bruce >>--
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Thanks to all for the assistance and direction.
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