In a message dated 97-03-12 16:31:59 EST, you write:
<< Dan, sorry but I must differ with you. My TR4 ammeter does not have any
LARGE cable running to it and it does not register when the ignition is
turned off. This is the original configuration. Maybe a check of the wiring
diagrams in Haynes or Bentley will show why. I'll check tonight. >>
I guess LARGE is a relative term, but when you consider that the entire
electrical load of the car, with the exception of the horns and starter on
TR2 thru 4A, and horns, starter, courtesy light and high beam flasher on the
TR6, pass through the ammeter, I would think a large cable would be required.
My experience is with a TR6, and the cables on it are quite large (compared
to the others). Perhaps the TR2 - 4A cars have such a light load that a small
cable is OK? (I have no info on the TR5 & 250, but would assume them to be
similar).
One thing I have found from working on my Triumphs and MGs is that the
factory tended to use cables that are at least one size smaller that
Electrical Engineering standards call for. For example, I had the main power
feed on my TR6 burn in two at the ammeter at 70 mph on the interstate at
night (a scary experience!!!). When I replaced it, I found the factory cable
to be a 28 strand conductor, rated at 17.5 amp. To handle the alternator
output, it should have been a 65 strand conductor, rated at 35 amp. Needless
to say, I replaced it with a 65 strand conductor.
For those of you who haven't gotten into British cable designations, they are
different than American. Rather than wire gauge, they are sized by the number
of strands of 0.30mm copper wire. That is the info I have from British
Wiring, my source of British wiring supplies. Are there other sizeing schemes
used by the Brits? If anyone knows, please let me know.
As for the ammeter not indicating when the switch is off, that is because you
have turned off all loads. I believe if you turn on the lights, you will see
the ammeter register the current, since the lights operate without the key.
I would be very curious as to the size wire you find on your TR4. I know it
will be impossible to tell for sure from looking - anyone know for sure?
Thanks for the response, that is what makes this group so interesting, and I
learn so much from it.
Dan Masters,
Alcoa, TN
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