Forum Discussion
theoldwizard1
May 22, 2017Explorer II
RoyB wrote:
Using a multimeter you you can tell by just measuring across the batteries terminals without the motor running and if the batteries are at 100 percent charge they will read 12.6-7VDC. Then turn your ignition on and start the motor. If the path for charging the batteries is good then you will see the DC Voltage across the battery terminals jump up to 13.6VDC or higher depending what your truck alternator setup is doing...
THIS TOPIC HAS BEEN COVERED A NUMBER OF TIMES !
First, 13.6V will NOT come close to fully charging a deep cycle battery that is at 50 percent state of discharge. Even 14.0V won't do the job ! Sure, if 13.6V is maintained it will not DISCHARGE further.
The short answer is, for "modern" (past 10-15 years) TV, YOU CAN"T GET THERE FROM HERE ! Modern vehicles use "smart charging" systems where the charging voltage will drop off to less than 14.0V shortly after the engine starts. 1/0 wire is not going to help this !
You need a DC-DC charger that will handle low (down to about 10V) input voltage. They exist, but none that I can personally recommend.
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