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Post by Teachndad on Mar 20, 2017 21:51:15 GMT -8
Hi Friends, Over a month ago, I bought a Tekonsha Breakaway system model 50-85-325. It's like this one link. You can just push a button on top to check the charge on the battery. Red means needs charge and green means its charged I received it and charged it overnight using a Schumacher .75 amp charger like this one. link Directions state that you should charge the battery with a charger that pulls no more than 1.2 amps. So, the charger meets that requirement. Came out the next morning and did the light test. You can push a button on the top and if the green light lights up, it's charged. Okay, so it passed that test. Three weeks later, I am finally able to mount it to the trailer. I mount it, but the external blue and black wires are left un attached to any thing else (job unfinished), but I did manage to ground the white wire to spot on the frame. I used a grinder to grind away old paint and rust and used some dialectric grease to support the ground connection. I push the little button tester and it shows the battery needs recharging. I thought these little batteries took a few months to deplete? Tonight, I went to recharge the battery thinking that was the problem, but the Schumacher charger went into pulse mode which means it's on maintainer mode now. So, it's not actively charging. I took my multi meter and set it to 12v on the battery section and I got 12.49 on the display. That tells me, (I think) that the battery is charged, no? So, anyone got any ideas as to why the battery even though its charged, is showing up as needing a recharge when wired inside the mounting box for the breakaway switch? Or what am I doing wrong? Thanks, Rod
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Post by Teachndad on Mar 21, 2017 15:22:25 GMT -8
Hi Friends,
Okay, for anyone ever researching this, here is a follow up:
Today, I called Tekonsha directly and spoke with a tech. On hold wait time was only about 10 minutes, btw. Not a bad wait time IMHO.
Turns out the threshold on these break away batteries for activating the green to red recharge light is really “tight”.
If the battery’s voltage is measured at 12.5 volts to 12.99, then the green light (charged) will come on. If it‘s anywhere lower - even 12.1 to 12.49, then it will show up red (recharge). Shouldn’t that range be stretched down to 11.0 to 12.0? Mine was measured at 12.49
The only sure way to detect if your battery is charged is to measure it with a multi-meter. He also suggested that once hooked up to the TV, it should then charge all the way up. I have to laugh a little. The whole reason why I bought this model was because of the battery check light. Cheers,
Rod
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cowcharge
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Post by cowcharge on Apr 9, 2017 6:07:46 GMT -8
My guess is that they made the cutoff "tight" for safety reasons. Maybe there's a sharp drop-off in brake effectiveness as the voltage drops, and they want to make sure their system will work on all the different models and ages of brakes, and levels of brake maintenance and effectiveness that there are out there. The tiny size of that battery also means that there isn't much extra capacity to play with... I hate sealed batteries.
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