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Dead batteries every morning

I turn the inverter and fridge off but if I don't run tripac batteries will be dead. Any ideas? Batteries were load tested and are fine. As soon as truck/hen set is turned off low voltage switch kills all power within 5 minutes.

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7 Answers

How old are your batteries? Might be time for new ones.

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Replace ALL your battery's. yes all your battery's regardless of age or condition. With multiple trucks and multiple road calls and multiple unhappy drivers I learned quick .... Battery trouble = replace them all at THE FIRST SIGN of dead battery problems. Check alternator output. If not charging up to 14 volts while engine running replace alternator with a 200 amp output alternator. Check the current draw with a good digital volt ohm meter. I forget the exact amp draw that is acceptable , sorry .... Yes there has to be a small amount of current draw if there is a computer ECM for the engine. Poor mans way to check for amp draw .... Disconnect all the battery's at there posts. Reconnect 1 battery , hold the ground cable to the post as you touch it if you see/hear a spark , you have a current draw on the battery.

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I disagree with just throwing a new set of batteries in the truck. Load test the batteries and if they are bad, then replace them. I replace mine all at the same time, even if 1 or 2 test good. My friend replaces only the ones that test bad, he changes 1 battery every 9-12 months, I change all of mine about every 30-36 months.

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I too disagree with just tossing the batteries in the wind if they do not test bad on a load test. You could be potentially tossing perfectly good batteries and not resolve a thing. I only replace them all if two are bad at the same time, otherwise I only replace the bad one.

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I to disagree with tossing out potentially good battery's , so I just give them to my drivers .... They won't go to waste. The cost of batteries are cheap. Multiple road calls , missed appointments , unhappy drivers = very expensive.

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There is clearly a typo in this post, cause I'm not sure what "Sony run tripac" means nor can I figure out what was trying to be said.

Did you mean to say that if you run the tripac the batteries will be dead? If so, it sounds like it's very possible that the alternator on your tripac is not putting out the correct amount of power to charge the batteries and run the system so they are draining the batteries.

If you meant you do not run the tripac (I'm not sure why you wouldnt) and they are going dead over a 10 hour break, it's possible you have weak batteries or something else is still drawing power. This problem would be worse in the colder weather as it's tough on batteries.

I suppose it could also be that the batteries are not being charged by the alternator on the big motor properly. You can test theory easily. While driving, what's the voltage show on the dash? When you stop, what voltage does it show?

Best thing to do would be get it to a good electrical shop. Any TA/Petro could load test the batteries and replace them if needed, they'd also be able to test the output of the alternator. Outside of those two things being wrong I wouldn't put much faith in TA/Petro or Wingfoot Truck Care Center type places.

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I am going thru the same problem myself right now. I tested the Batteries and they test good. Found out I have a load draw from the Rigmaster. I just have not been able to locate the draw yet. How I did it, was to disconnect everything from the Batteries and then Test the draw as I hooked each cable back to the batteries. If you hook the ground and then put a tester between the Pos. cable and post you will be able to read the draw from that cable. Remeber you will have a slight draw on the truck cables for the ECM.

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You can also have a paracitec draw test done. This will tell you what is drawing them down.

I would also put a low voltage disconnect on the truck. This will disconnect the batters from

the truck when the voltage drop to a preset level.

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If you're talking about a Sony, Sony= Sony TV or Sony audio system. If you leave it on, the TriPac's batteries (or the truck's batteries) will be dead in a matter of hours. The audio system or TV will consume excessive amounts of power, just like a fridge or inverter. In fact, the typical stereo is 200-300 watts. Make sure you shut OFF your TV, radio and/or stereo system BEFORE you leave the truck.

Now if you're talking about the TriPac itself causing the power draw instead of a stereo or TV and the batteries are dying when you run the APU, there are several things you can do.

First, get the batteries load tested and replace any bad ones. If they are good, take them out of the truck and properly recycle or reuse them. If they're bad, have your shop or battery vendor recycle them. TA and Petro can do this.

Second, have a shop (such as a dealer) test your truck's electrical wiring and inspect it for corrosion. You might also have a problem with your solenoid/starter relay, and it's location varies by truck model. Have it tested and if necessary, replace it. While you're at the dealer or shop, have a low-voltage shut off installed or programmed into the truck and have a draw test done. This will help locate the issue and narrow down the cause.

I've had a couple starter relays fail and a loose wire on the ignition key switch cause parasitic draw before. Learning how to troubleshoot electrical can seem daunting at first, but with practice, you will find the root cause.

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Mine did the same thing. It turned out to be a bad wire from the Apu alternator to the truck batteries. White wire in the loom .

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