"Jim Thompson" > wrote in message
...
> On Fri, 19 Nov 2004 22:26:37 -0000, "exxos" > wrote:
>
>>
>>"maxpower" > wrote in message
...
>>>i would check out the circuit before cutting and adding resistors and
>>> regulators, try to keep eveything working the way it was designed, many
>>> a
>>> times i have found the 8 way connectors loose/corroded causing a no
>>> charge
>>> condition. just a simple back probe test to the PCM
>>
>>
>>assuming you replied to my msg, the lamp was part of those car diagnostic
>>"features", I think the idea was that if the regulator shorted out it
>>would
>>light the lamp on the dash... only mine had a I/O short (at some point in
>>its life) so the lamp never lite, but yet the battery was charging to to
>>19V... It also doubled up to raise the regulator voltage to about
>>13V....so
>>much for technology..... good idea in theory though ;-)
>>
>>chris
>>
>>
> [snip]
>
> I think you'll find that the lamp was looking at the neutral
> (mid-point of the "Y") terminal of the alternator, which is where most
> idiot lights get their information... actually quite good at
> indicating faults _before_ the battery goes dead.
It was in the ground, I actually grounded the point instead of going via the
lamp, battery only got around 11V on it though at least it proved the point.
It was actually a 12V regulator, I measued it with a DMM at the time and
even at high revs it only ever hit 12.5V, so it needed a higher ground ref,
hence via the dash lamp. I would never have thought they would do such
tricks like that on cars, ive seen it countless times on electronics
equipment, though was supprised to see the same trick on a car.
Chris
>
> ...Jim Thompson
> --
> | James E.Thompson, P.E. | mens |
> | Analog Innovations, Inc. | et |
> | Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
> | Phoenix, Arizona Voice
480)460-2350 | |
> | E-mail Address at Website Fax480)460-2142 | Brass Rat |
> | http://www.analog-innovations.com | 1962 |
>
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