Join Date: Aug 2013
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Buzzing and low voltage
It is getting cold here in MI and I am having a new problem with my truck. I have a F-250 99 7.3L about 170,000 on it.
When I turn the key to warm the glowplugs, the vacuum pump will buzz for about 30 seconds. It only does this if it has sat for awhile. My issue, and concern, is that when i first turn the key the voltage is very low. As the vaccum builds up pressure, the volts start to climb. After the vacuum stops buzzing, the voltage is up to the normal area, BUT when I turn the key to start the engine, the volts dip really really far down. Sometimes almost to 8. The truck will still start, but I am wondering why the Voltage is all messes up???? I am just afraid one of these times it won't have enough juice to fire.
With all of that said, I have 2 brand new interstate batteries that are only 1 month old. I have a brand new alternator that is less than 1 month old. If it gets 40 or below, I plug both batteries into the tender at night. When I go to start it in the morning, both batteries are fully charged (indicated on the tender) and that doesn't seem to help it any.