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From digest.v6.n59 Tue Jan 14 14:05:28 1997
From: "Steve D'Gerolamo" <steved3_at_village.ios.com>
Date: Tue, 14 Jan 1997 08:24:51 -0500
Subject: Valeo Alternators & Electrical Troubleshooting
Some of the newer cars are coming through with Valeo rather than Bosch
alternators. It will be important to know which one you have when it comes
time to replace the alternator or just the voltage regulator. I've seen 3
cars in the past few months (at different shops) come in (on the back of a
flatbed truck) unable to start because of an alternator failure (all 3
cars..a 525i, a 318ti and a 318i had Valeo alternators). The DME will shut
down on overcharge (either spike or sustained) and the car will not run. On
the 318ti, the voltage regulator was replaced and the car came back a few
days later with the same problem, this time to get a new alternator.
As BMW's do not come with any electrical instrumentation, its a good idea to
check your battery and charging system a few times a year. With a simple
voltmeter across the battery (or hot plug & chassis ground at the engine
compartment for cars with batteries under the rear seat), run 3 basis tests.
Cranking voltage (should be 9.5v or higher), charging voltage (13.5 - 14.5
volts with the car running) and standing voltage (around 12.5v with the
engine off). The battery should also be checked for fluid level (add
distilled water as needed) and if your battery is under the rear seat or in
the trunk, make sure the vent tube is hooked up/plugged in properly.
One last comment...if you've got a newer car (especially a 525i) and your
car won't start (no cranking current), check the fusible link (80amp). BMW
had a lot of problems with these and the price has come down from a few
dollars to around $.75 . Keep a spare in your glove box. SD
Steve D'Gerolamo c/o The Ultimate Garage, Emerson, NJ (201-262-0412)
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