Ferrari Mailing List: Re: Alternator idiot light

[Jeff Greenfield (coyote]

13.5 volts is a bit low, should be more like 13.8 - 14.2.

Could be a bad regulator, the alternator, or a wiring problem (not  
that that ever happens on a Ferrari-:)

Some alternators are mounted in rubber bushings and have an external  
ground wire. A bad ground to the alternator (or engine ground) can  
cause a charging problem.

Kind of hard to diagnose long distance, those of us in the biz of  
repairing cars have special tools to help pinpoint these kinds of  
problems.

Jeff

Sent from my iPhone

On Jun 13, 2008, at 2:17 PM, Martin Stark <MStark [at] Copper.net> wrote:

> The alt idiot light is staying brightly lit on my '87 tr.  The weird
> part is that voltages as measured at the battery appear normal (about
> 13.5v) under light or heavy load.  I'm thinking failed regulator.  Any
> thoughts???
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