John :
IMO the most likely explanation is a bad diode inside the alternator. A
single open diode will allow it to still work some, at greatly reduced
capacity, but I believe will cause exactly the symptom you describe.
One other possibility is a bad connection between the alternator output
and the battery. Try checking the voltage between the output tab on the
alternator and the battery hot terminal, with the engine running at
2000-3000 rpm and the headlights on (and the alternator fully connected,
of course). More than about a volt indicates a problem in the wiring.
Randall
john taylor wrote:
>
> Hello Listers,
>
> The red ING light is on in my TR-8 and thought I plan to convert to a GM
> unitI thought that I might fix this one as a spare.
>
> So the dash lite is on low when the motor is at idle and gets brighter as
> motor speed go up. It flashes in an even pulse at around 3000rpm.
> I have set a volt meter at th ebattery and it shows 13v and go to high 14v
> and just hitting 15v and switching. So the alernator seems to be working and
> so does the regulator as you can watch it switch on the meter.
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