Thank you for for reply and insight!!! I found the problem it is in the
wiring between the ignition switch and the the warning lamp. I was still a
little confused until I determined that the voltage
comes from the ignition switch through the lamp and making the gound
connection in the alternator.
Also from the mailing list I found out where the ballast resistor is after
all these years
Dave Simpson 76 spitfire orginal owner
04:53 PM 3/30/97 -0500, DANMAS@aol.com wrote:
>Sat, 29 Mar 1997, David R Simpson wrote:
>
><< I have just replace the alernator on a 1976 spitfire, after a couple of
><< years of non-use. Now the ignition warning light only comes on when the
><< alterntor is putting out 14 volts, it is off with the ignition on and the
><< car not running and then comes on after the car is running. I assume that
><< the signal for the light comes from the small brown & yellow wire from the
><< voltage regulator inside the alternator. Any thoughts or good trouble
><< shooting manual that explain how these system work. Tanks Dave Simpson
>
>
>Dave:
>
>Usually, this means you have a bad Battery. When you turn on the key, the
>battery provides power through the lamp to the alternator, which is not
>producing power. This also suplies a small field voltage to "kick start" the
>alternator. Once the engine is running and the alternator is producing, equal
>voltage (or very near equal) is present on both sides of the lamp, so it is
>not lit. Power to drive the lamp from the alternator comes from a separate
>set of diodes, just like the main diodes which provide charging current.
>After the alternator is producing, these same diodes provide the field
>current to the alternator.
>
>Are you starting the car from it's own battery, or jump starting it? If your
>battery is good, and the Spitfire is wired like a TR6, I can only see one
>possibility. The Brown/Yellow wire goes from the alternator to the lamp, and
>a White wire goes from the lamp to the run position of the ignition switch.
>Since the rest of the car is working, the ignition switch is good, so the
>white wire from the lamp must be off, and touching ground somewhere. I don't
>have a Spitfire schematic, so I can only guess that it is like a TR6 - any
>one care to donate a xerox copy to me? Power to drive the lamp from the
>alternator comes from a separate set of diodes, just like the main diodes
> which provide charging current.
>
>Dan Masters,
>Alcoa, TN
>
>
>
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