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Super_Dave

Harrisville, UT

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Joined: 01/19/2007

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Posted: 06/08/20 07:19am Link  |  Quote  |  Print  |  Notify Moderator

I had a battery that I kept charging and would pass my multi meter voltage test but would not work when connected. I didn't realize that the battery could pass voltage but fail under load testing. HF has an inexpensive load tester or the auto parts store as mentioned above.


Truck: 2006 Dodge 3500 Dually
Rig: 2018 Big Country 3155 RLK
Boat: 21' North River Seahawk


ajriding

st clair

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Joined: 12/28/2004

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Posted: 06/08/20 09:26am Link  |  Quote  |  Print  |  Notify Moderator

10.5 volts should make lights work, barely, so 12 is plenty, but yes, volts and amps are different. It could be a dead battery that just does not have enough amperage to do anything. Death could come from not holding voltage or from not having enough amps.

Take to auto parts store for the free charge n check.
You likely damaged it over the winter, most likely you did. If you let it sit all winter not being charged, then you might as well just buy a new one. Some "chargers" will let a battery die also, they just do not give the battery the right voltage and cannot regulate the voltage according the the State of Charge the batteries are at. Over-charging will do damage also.

Get a real deep cycle battery, not these marine ones. They are called Golf Cart batteries typically and are about the same price.

Cleaning the terminals is huge huge too. Sometimes the battery cable under the cable coating can get corroded and green and not conduct the electricity too, but this is unlikely in your situation.

***edit*
I reread your OP.
"12.5 VDC at battery and 13.75 VDC on wire leads from trailer"
after a day if the batter will not get past 13 (assuming you have a modern and decent charger) then the battery just will not take a charge and is dead. If you leave batt unplugged for a day then I bet voltage drops even more. The 12.5 yo uare seeing might just be a "surface" charge.

Grit dog

Black Diamond, WA

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Posted: 06/08/20 09:31am Link  |  Quote  |  Print  |  Notify Moderator

^Tue story on corrosion of the cables and connections.
Recently had an electrical issue with an older vehicle. Everything clean, look like new etc. good battery alternator etc.
After checking all the grounds, took pos cable off battery and it was super corroded and arcing. Did a bunch of cleanup on it and good as new.


2016 Ram 2500, MotorOps.ca EFIlive tuned, 5” turbo back, 6" lift on 37s
2017 Heartland Torque T29

mdcamping

CT

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Joined: 03/04/2007

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Posted: 06/08/20 05:09pm Link  |  Quote  |  Print  |  Notify Moderator

In the end, I just decided to get a new battery.

Thank you everyone for your help

Mike


07 Toyota Tacoma,Double Cab, Max Towing 6,500lbs GCWR 11,100lbs
2011 Jayco X20E, Pro Series 800lb Weight Distributing Hitch
Husky Sway Bar, Prodigy Electronic Brake Control
McKesh Mirrors. "Towing with 210K"

Where we have camped


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