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1966 mustang charging system question

1187 Views 6 Replies 6 Participants Last post by  Carbine kid
Hello all,
This is my first thread on this great looking site so I'll try and keep it simple I've had my 1966 coupe for about 18 years now the car is mostly original it has been sitting asleep for the last 8 years of its life so I am starting to put some time into it I've done quite a bit of work to it this year got it running rebuilt the carb,tune up etc a couple of days ago I took the longest trip so far in it a 100 mile round trip and about half way through I started smelling sulfur smells stopped the car checked around couldn't find anything wrong keep driving home rechecked at home and found that the battery was very hot and venting here's my question does it sound like the voltage regulator? That is original to the car as is the alternator the the wiring seems ok the battery was replaced 6-7 months ago any help would be appreciated.
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You need a voltmeter, most likely the regulator is overcharging the battery, but you need to check the voltage to be sure, if you don't have one (W-mart has a DVM for about $20), normal engine running voltage should be 13.6-14.6 temperature sensitive, warmer is near the lower voltage and colder is nearer the higher voltage, temperature extremes can push the voltage beyond this which is normal. Your battery could also have a shorted cell which will cause a overcharge type condition even with a good charging system, battery voltage without the engine running should be around 12 volts if it is around 10, then you have a shorted cell. Good Luck.
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