![]() ![]() If this back battery was getting charged by the alternator, I shouldn’t be losing voltage from 2 LED strips and I’d assume I should be getting the same reading on the front battery (13.87) as the back (12.27) with truck and alternator ON. Then to throw another kink in to this scenario, I switched on my bed LED strips which are hardwired into the back (bed) battery and can slowly watch the voltage drip from 12.37 to 12.30 to 12.29 to 12.28 and so on, while the truck is running and all the wires are hooked up. BUT when I hook the rear wires up to the rear battery and start the truck I get 13.87V at the battery in front (engine) and 12.37V at the back (bed) battery. ![]() I tested the front (engine) battery and it’s at 12.11V, great, power is making its way from the engine batt to the rear batt. I almost drained the front battery when I let my kid play in the bed of my truck with the compustar recording her while the truck was off (about an hour of recording) wtf?Ĭlick to expand.Good call, to make sure the fuse was working I disconnected the wires going to the back battery (bed) and tested the WIRES, they came in at 12.11V. Both batteries are Toyota brand, but it strikes me weird that if the back battery isn’t being charged by the alternator, why isnt it a deep cycle? I am pretty familiar with batteries having worked around golf cars for years, but this setup is neither “in-line” or “in parallel” from my knowledge. I included a pic of my current set-up, anybody care to explain how the hell these two batteries are “connected” other than the positive wire connecting them, like, how in the hell is this back battery supposed to help the front battery? I’ve included a pic of my set-up from a generic pic off google, if anybody had any info. I plan on using this truck and hopefully the second battery for camping and fishing off the grid but when I put a volt meter up to the rear battery (bed) it doesn’t charge with the alternator (truck on). The trucks previous owner had most of cartoys installed in the truck over the years (2 amps, 10” sub, alarm, radar detector, compustar dash cam, pioneer avic deck) AND a second battery installed in the covered bed. Hey guys, Long time Toyota owner, first time tundra owner here with a question about the current setup in my truck. ![]()
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