Date: Thu, 17 Feb 2000 09:47:59 -0800
From: "wgmoore" <>
Subject: Re: battery light stays on when its very cold

This has to do with the energising of the fields in the alternator. The fields are originally energized by the idiot light or similar device if you have a guage, then when the alt is producing current on it's own, the fields are energized by the alt out put. If the alt quits working the idiot light comes back on and lets you know. If the idiot light burns out it will not "boot" up till the alt hits 2,00 rpm or so (there all differant). The cold affects the light as the resistance in the wire to the fields from the idiot light will allow the idiot light to back up a little and glow even though the alt is working fine- (Ask and vw bus owner if his Gen light is completly off.) <> wrote in message news:888j5f$7mt$ > Same happens to both our Saabs, even when it's not so cold - believe it > or not. One is an 86 900 8v (Original alternator)and the other a 91 > 16v. I suspect it's some thing to do with the voltage regulator built > into the alternators, because once the light goes out it stays out even > at idle. Doesn't make any difference if the headlights are on or off, > but does if the HRW is on, probably a load thing.I don't worry about it > Malc > Scotland > > In article <>, > mcbagpipernopsamcom (McBagpiper) wrote: > > The battery light stays on in my 92 900s for 15-30 seconds depending > on how > > cold it is. This happens only after an overnight. its below zero > mornings. > > if you rev the engine a bit it will go out. i have new belts and > they seem > > tight. Am i about to loose an alternator. EVERYTHING SEEMS FINE > OTHERWISE. > > > > > Sent via > Before you buy.

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