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Old 09-21-2021, 06:35 PM   #1
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Replacing Magnetek 6345 with a PowerMax 55A

Hi All,
Our Magnetek 6345 went out in our truck. We bought a PowerMax 55A to replace it. I've seen others post about doing the same, but I'm not sure how to tie in the battery charging connections? Would you just move those battery terminals to the PowerMax output terminals?
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Old 09-21-2021, 06:40 PM   #2
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Yes. So long as the Powermax output goes into the +/- battery connections (through thick enough wire), you're good.
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Old 09-21-2021, 07:18 PM   #3
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Ok, I was going to use a 6 GA wire for that. So to be clear...I will have 4 wires connected to the PowerMax output terminals. PM(+) 1 for Battery pos, 1 for 12V pos bus PM(-) 1 for battery neg, 1 for 12V neg bus.
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Old 09-27-2021, 09:31 PM   #4
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Ok, I think I have something wrong. With this PowerMax should I connect it to the battery charge wire (Red) and the 12V panel Neg (White)? Then leave the converter output (Blue) not connected?
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Old 09-28-2021, 11:54 AM   #5
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Connecting either wire to the PowerMax output did nothing for the 12 vdc in the truck. If the house battery is completely dead due to the old converter dying will that have any effect here?
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Old 09-28-2021, 08:07 PM   #6
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Sooooo I get 12v at the panel, but I don't get anything up front. Cig lighter/fans get nothing. Checked all the fuses and they are good, what am I missing here? I did leave the battery charge cable disconnected because I only get 1.3v if it's connected for some reason.

Anyone know what checks to make in this BCC?
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Old 09-28-2021, 08:53 PM   #7
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Which model Powermax did you get?
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Old 09-28-2021, 09:26 PM   #8
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This one: PM3-55

https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
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Old 09-28-2021, 10:05 PM   #9
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Same one I got. Should be simple - you have two main wire connections on back, + and -. So long as they hook in to the + and - of your 12v house system, they will charge your house batteries and power your house 12v needs.


I'm confused, though, when you talk about the "up front" things like cig lighter. If I'm understanding correctly, you're describing stuff that runs off of the chassis battery, not the house battery.
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Old 09-28-2021, 10:21 PM   #10
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Yeah, the old converter/panel had 3 leads. (blue- 12v) (Red - Battery Charge) (White - Common) The battery charge line goes up front to what I have learned is the BCC and right now I have it disconnected. I did that because if I connect it the voltage goes to around 1.3V But yes, it seems that 12v systems in the dash are not working now (Fans/radio/lighter) but the fuses checked good. The house batteries have around 6.03v on each or 12.06v together when I checked them.
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Old 09-28-2021, 10:45 PM   #11
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If you plug the converter in, do your house batteries then measure 13-14 volts?
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Old 09-28-2021, 11:10 PM   #12
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Not sure, I haven't checked with it connected. I was more concerned that the converter output dropped to 1.3v when the battery lead is connected. I'll check that tomorrow sometime. Thanks for the help so far!
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Old 09-29-2021, 06:23 PM   #13
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Ok, I just connected it and the house batteries read 11.99V and the converter output reads 1.302V it seems there is something dragging it down towards the front. I pulled all the 12V fuses to isolate those lines from the battery line and no change. I disconnect the battery lead and output goes back up to 14.72V

I did actually find a guy that changed the same converter to this same panel...well one that wasn't monkeyed with by previous owners

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Old 09-30-2021, 11:59 AM   #14
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I'm baffled. It's almost as if your chassis battery up front was shorted out internally - or maybe even the wiring going to it is shorted.
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