Question about Cars & Trucks
I charged my 12v battery full...turning the key switch over it tries to turn over (1/4 visually with the hood up)but then dies...battery seems ok at 12+ volts...what could it be crank amps? solinoid? ??
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Posted on Jan 02, 2017
SOURCE: 24 volt charging problems .2
A 12 volt battery is actually 13.2 volts fully charged. If you are reading 16 volts, you are probably getting extranious voltage from the system somewhere, especially if the vehicle is running when you check the voltage. The alternator will put out about 15-18 volts to charge the battery normally, and yours may put out 28-32 volts to charge them in series, but the batteries, when disconnected, should never read more than about 13.2 volts each. Typically, it will read about 12 1/2 volts when disconnected. COMPLETELY DISCONNECT BOTH OF THE BATTERIES. If you still read 16 volts when it is disconnected, you must have a bad meter because the battery can't produce that much voltage, no matter what. (Six 2.2 volt cells connected in series inside the case.) Put the meter on a known good battery on another car that is not running and see if you get the same reading. It sounds like the other battery is almost dead, regardless, and it sounds like your series/parallel switch may be malfunctioning. (That is the switch that puts the battery in series to run the 24 volt starter, then puts the batteries in parallel to run the remainder of the vehicle on 12 volts. This is all assuming that you have a diesel vehicle with a 24 volt starter and that is why you have two batteries.
Posted on Aug 19, 2008
It could also be the VATS system faulty. The Theft Deterrent Module (TDM) also controls the starter relay, so if the TDM is faulty it could definitely be that your car is not cranking.
Posted on Jan 29, 2010
most likelt the electrical ignition switch located on the transmission is shot
Just take a volt meter to see if power gets to the solenoid wire. If not replace that switch
Posted on Sep 10, 2010
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