[6pack] Alternator warning on, ignition off

[John North]

Thanks for the help Bob.   I do have the correct lamp connected.   I am
unable to pull off just the N/Y wire from the alternator, because both
Brown wires and the Brown/Yellow wire are on a single plug that pushes into
the alternator.   If I remove this connector then the warning lamp goes
out, but I'm not sure this is definitive.   With the connector removed
from  the alternator and 12v jumpered to the Brown/Yellow connector, then
the warning lamp lights.   I have read over Dan Masters book, but I am not
clear that the Brown/Yellow wire is live only with the alternator turning,
ie the car running.   Is that the case?   If so, then, as you say, there's
something amiss in the alternator.   Are the diodes replaceable or am I
looking at a new alternator?

John North

On Tue, May 1, 2018 at 12:38 PM, Robert Lang <robertlangtr6 at yahoo.com>
wrote:

> Hi John,
> The first thing I'd do is check to make sure that the proper light is
> inserted in the correct hole. I have switched oil pressure and alternator
> lights around when in a hurry or not paying attention. The alternator light
> should have a brown / yellow wire coming from the alternator and a white
> wire going to the ignition switch. Try pulling the brown yellow wire from
> the alternator and see if the light goes out. If so, there may be a short
> in the alternator diodes. I have seen that happen plenty of times. If the
> ignition light does not go out when you pull that wire form the
> alternation, then you have somehow connected the ignition light to the
> wrong circuit and there's voltage present. Failing that, if you have a a
> test light - poke around to see what's going on, but the basic problem is
> that a brown wire in the circuit is connected to that ignition light and as
> you may know, the browns are hot all the time as well as un-fused, so be
> careful. The only other things that I can think of are related to hooking
> up the wrong lamp in the ignition hole in the tach, so make sure you're
> working on the proper circuit.
>
> Good luck!
>
> Bob Lang
>
>
> On Tuesday, May 1, 2018, 11:44:30 AM EDT, John North via 6pack <
> 6pack at autox.team.net> wrote:
>
>
> I have been replacing the dash support and in the course of that
> disconnected  overdrive and other wiring wiring, but now I put things back
> together, the alternator warning light is on even when the ignition is off,
> key removed.   Can't figure this out, anybody got ideas?
>
> John North
> 1976 TR6
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