At 07:01 PM 5/14/2011, Poppie Jagersand wrote:
>My alternator is not charging. After various tests I found that the
>voltage on the blue D+ wire to the alternator was 5V. I looked in
>the alternator trouble shooting section in the Bentley manual. It
>doesn't list the D+ voltage. Isn't it supposed to be 12V? Could
>something be loading it down? (I already disconnected the fridge
>relay which I believe also runs on this circuit.)

It won't be +12 until the alternator starts charging.  I can't get to
mine now to check the voltage but +5 seems not unreasonable.  Pending
someone coming up with an actual reading, if your ALT light is the
same brightness as usual then I think D+ is probably ok (when it does
come up to [charging voltage] the ALT light will go out; in the
meantime there's a resistor parallel to the light which is supplying
maybe 100 ma to that terminal to allow the alternator to begin charging).

Yrs,
d