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Voltage reg, alternator in car:
Posted by RayF (more from RayF) on Sat, 26 May 2012 12:47:45
In Reply to: Re: Alternator voltage regulator installation, SaabStalker , Sat, 26 May 2012 11:53:51
Saabstalker:

I swear by this. First of course, remember to disconnect the negative battery terminal and set it far enough from the post that it won't accidentally reconnect while you work.

Then you'll need a LONG #2 Phillips screwdriver, what someone on here called a "cabinet" screwdriver, for access and ease.

I recall having to angle it just above the oil pressure sender, and it being harder to get at one of the two screws than the other.

There are, yes, two screws, into back of alternator case, that hold the entire unit in. No wires to deal with, it makes its own contacts.

My best tip on this is, you will need to crack the threads free to get it moving, then they'll be perfectly clean and easy to turn no matter how crudded up the engine compartment and alternator may look. What I do is, take a hammer, and, with screwdriver tip in the screw, tap the back of the screwdriver just as you apply pressure to twist it free. The shock of the hammer works kind of like an impact driver, to wake the threads up and get it to start turning. Also, it has the effect of making sure your screwdriver stays down in the slots of the screw instead of jumping out as you try to twist.

A Phillips will tolerate being slightly angled in the screw, and the tapping with the hammer makes sure it stays in place.

Putting the new one in, it's kind of a twist-it-down-and-in kind of motion. You bring the brushes in contact with the slip rings, at a little bit of an angle, then push them home as you put voltage reg down onto its spot. Hold it there and start one screw in. Run that screw in all the way, loose, then twist voltage regualtor back and forth while you find the threads for the second screw. Then run them both home. Might be a good idea to tap on screws also on final tightening.

You can, by the way, buy Bosch brushes for your old voltage regulator and make it good as a backup, for very little money, if you're handy with a soldering iron. Almost always it's the brushes that wear out, while voltage regulator itself is still fine.

Another caution - - inspect your slip rings, on the alternator armature itself, by feel if not by eye. If they're too worn they can take out a new set of brushes pretty quickly. Not common, but happens on high miles cars.

posted by 71.173.9...
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