[Healeys] Voltage Regulator Problems

John Harper AH at jharper.demon.co.uk
Tue Sep 18 02:11:23 MDT 2007


Rich

>Today I removed both leads to the generator, joined the terminals with 
>a short piece of wire, removed the fan belt to free the generator 
>pulley, touched a wire from power (A1) to the bridged terminal wire and 
>the generator motored properly in the correct direction (same as the 
>engine turns) That confirms to me that the generator is okay, charging, 
>and polarized correctly.

This proves that the generator is connected correctly internally and is 
most likely polarised correctly but it only says that it is most likely 
CAPABLE of charge.

If all polarities are correct then your excessive voltage is coming from 
the generator itself. This means two things. The regulator is not 
controlling the charge voltage. It should put a resistor in series with 
the field 'F' winding when the correct voltage is reached. This resistor 
is in the back of the control box. However it also says the cut out is 
not making when the generator voltage exceeds the battery voltage. If it 
did the battery would hold the voltage down but excess current would 
flow from generator to battery. This would result in the generator 
heating up.

But as you see we appear to have two control box functions not working 
and this is unlikely. I would therefore suspect the earth (black) wire 
to the control box; this connects to both regulator coils and neither 
will work if not connected.

Regards

-- 
John Harper


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