In a message dated 08-May-01 22:37:04 Eastern Daylight Time,
pairets@luna.moonstar.com writes:
> I purchased a tr4a solid axel yesterday and would like to know if it is a
> positive ground system or negative ground system.The car did not have a
> battery in it. The car has a # of 71191 CT. Any all help much appreciated.
> Tom
> in Va @ pairets@moonstar.com
>
>
First off the car was built in 1966. (for '66 the commission numbers were
CT(C) 66148 - CT(C) 75172 - The "C" in parentheses indicates IRS - so yours
should be CT 71191 if built as a solid axle.)
According to Piggott (Original TR4/4A/5/6) all TR4A's were negative ground.
Simplest way to check is by hooking up the battery with the negative terminal
to ground. If your ammeter registers correctly then you have it. No problem
doing that -- just hook up the battery, turn on the lights and see if you get
a discharge indication (-) on the ammeter. If it registers as minus then you
have negative ground.
If it registers as charging (+) then you have positive ground. If you have
positive ground, come back to the list and we can tell you how to convert to
negative ground. Hope that helps.
Art Kelly '64 TR4 CT33118L (negative ground since 2000)
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