That is a pretty high draw. You might want to try disconnecting the wire that goes directly to the starter and alternator. How are you checking the draw? Do you have your meter leads in series between your negative battery terminal and negative battery terminal.
SOURCE: 12 Volt Cigarette Lighter / Accessory dead
Most likely just replace it. You could pull the fuse and then use a small screwdriver to try and pull the tabs inside the receiver in toward the center a little. It could be that repeated insertion and extraction of the lighter or accessory plug has bent them outward enough that they're not making sufficient contact to power what you plug in. If that doesn't work, replace it and then put the fuse back in.
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.
SOURCE: 1997 dodge ram 1500 gen light comes on and the battery gauge jump
Replace the alternator if it's output is too low the gen light will come on,could also be loose or dirty connections at alt amd bat
SOURCE: cadillac escalade ext will not start dic message
A battery can read 12 volts yet be weak in cold cranking amps, try a jumpstart and if that works have your battery load tested. Im betting your gonna find the battery fails the load test, meaning it needs to be replaced..
SOURCE: 2006 Chevy Silverado alternator intermittent charging
Perfectly normal.
Starting with the 2005 model year, light duty full size pickups and
utilities are equipped with a new Regulated Voltage Control (RVC)
system. This system reduces the targeted output of the generator to
12.6-13.1 volts when in "Fuel Economy Mode" to improve fuel economy.
The generator may exit "Fuel Economy Mode" if additional voltage is
required. This will cause the voltmeter to fluctuate between 12 and 14
volts as opposed to non-regulated systems that usually maintain a more
consistent reading of 14 volts. This fluctuation with the RVC system is
normal system operation and NO repairs should be attempted.
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