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September 29th, 2008
Q & A: Alternator Problem
Thursday March 27th, 2003
John,
I replaced the alternator on a 1974 MGB GT. I am still not getting a
charging voltage at the battery. I checked the voltage at the plug that
attaches to the alternator. The center terminal reads 12 volts, the A
terminal 12 volts but the I terminal is only 1/2 volt when the ignition
switch is turned on; should that also read 12 volts? Perhaps there is
excessive resistance in that circuit. I am thinking of running a jumper
from the battery to the I terminal and then checking the charging
voltage. Is this a good move?
The schematic shows that the I terminal is connected to the Alternator
warning light. I can't recall ever seeing an alternator warning light.
Is it possible I don‚'t have one? Thanks
Fred Jacobowitz
Fred!
YES, your 1974 MGB/GT DOES have an ignition light. It lies between
the tach and speedo, next to the bright light indicator (blue). The
ignition warning light lense is red. It may be that the bulb has bu... read more
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#152 1957 MGA Engine
Tip of the Day
It makes no difference how quickly your MG will accelerate if it cannot
stop! The proper functioning of your brakes must ALWAYS be at the
top of your list of priorities. You owe this degree of safety to yourself,
your passenger, and all others on the road.
John H. Twist (Fall, 1980)