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Old 06-28-2011, 01:30 PM   #1
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testing battery [re-]charge function

is there a quick real-time test to determine if the system that provides for the trailer battery to receive a charge [while towing/from Tow vehicle] is functioning correctly? my TV mechanic confirms the tow vehicle is properly "sending" the charge. Is there a proactive way to confirm the charge is "receiving" properly to the TT battery?
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Old 06-28-2011, 02:48 PM   #2
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Do you have a multimeter? If so, measure the voltage at the battery before and after plugging in the 7 pin. If you see the voltage rise, then you should be charging.
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Old 06-28-2011, 02:48 PM   #3
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test voltage at TT w/eng/acc off,..then start eng,and test batt voltage,..best if batt is drained some.voltage should slowly rise slightly.
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Old 06-28-2011, 03:07 PM   #4
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we must have been typing at the same time,also...u may need to have ur vehicle running around 1100 rpm
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Old 06-28-2011, 03:37 PM   #5
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Quote:
Originally Posted by jwb023 View Post
we must have been typing at the same time,also...u may need to have ur vehicle running around 1100 rpm
Yep!

OH - one other thing you might try to check -- with the battery slightly discharged on the TT - leave the car off and plug in the 7 pin. See if the voltage goes up slightly. If not, turn the key to on, but dont start it and check the voltage again.

On some TVs - like my Chevy - the 7 pin is hot all the time. If I were to leave the TT plugged in for a long period of time you risk of draining your TV.

On the plus side, if I keep my 7 plugged in at the camp site it tops off my TV battery
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Old 06-28-2011, 04:04 PM   #6
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Thanks for the info - I can do that. Sounds like I can test my isolator too - if I have one:hihi:
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