Looks like my wires being too small was a factor in this charger failing. Looking forward to getting this right next time round and not smoking out my car on the highway... Thanks for all the helpful tips!

I’m no expert mate but I believe the DCDC charger needs to be as close to the second battery as possible. not sure why you have the charger right in the back and the aux battery in the front.

You should just buy the wiring kit from kings, it comes with the correct wire size and a maxi fuse. So many people bag kings stuff but they themselves are usually the reason the component failed. I have one of these 40A dc-dc units and it is great and never gets warm let alone hot. If you are gonna wire in something do your research.

Buy once cry once, there's a reason why redarc is the price it is.

sorry mate your wire way too small, you need at least 25mm wire 170amps draw. thats why your unit overheated.

I've got mine all set up and absolutely love it only suggestion I'd make it having the dc-dc charger out in the open not under there as they need air flow to cool down they produce a bit of heat when fast charging and for your set-up your really only need the 25amp one 40 it's way over kill I'd only use on of those when dealing with 200+amph batteries best of luck though 👍

Install error. Always read the instructions. Need at least 6B&S or 100amp equivalent. Not only that but at least wire in a maxi fuse from your alternator. I advise wiring in a smoke detector like they do in campers as well.

This has me a bit worried as I just installed one of these last week. Well, my dad installed it and I watched because if I did it, the ute would have burst into flames by now. In my setup though, the charger is less than 30cm away from the auxiliary battery and the cable from the alternator is fused at both ends with inline midi fuses. I'm also running a shunt and monitor. As for the size of the cable from the crank battery to the DC to DC charger? Not sure, as it was from my dad who had it left over from wiring up his caravan. I believe it was 8mm/75amp cable. With 40amp fuses at either end, it's not the weakest link so I'm not concerned about that. My alternator only puts out about 30 amps, so short of getting struck by lightning, I don't see that being a problem. The sketchy capacitors thing is not good news. How likely it is to be an issue is anyone's guess. It would be interesting to know how much current yours was drawing when it cooked off though. I do have some more wiring to do. I am wanting to put in an outlet panel (one of the kings ones with voltage, two cigarette lighter outlets and dual USBs) into a home made centre console. Any tips regarding practicality, routing wires or anything else that seems relevant, I'm all ears. At the moment, it is at concept phase, so if there's a better way of getting power from the aux battery in the rear of the cab in a 1996 Holden Rodeo, I'd love to know.

I'm a bit confused with your setup. You have dual batteries under the bonnet, and a DC-DC charger right down the back. Are you charging the under bonnet battery with the DC-DC? If yes, the installation is flawed because of the huge long cable runs. You said you used 50A wire, which is too small even from the alternator the the charger - if you are then running another 50A wire to the battery up front it won't charge much if at all due to severe voltage drop. If you have a third battery close to the DC-DC charger it's OK to hook that up with 50A cable but you still need bigger wire from the front as well as resettable circuit breaker up the front. Kings gear is generally OK if you are happy with 7/10 quality and performance. Unlucky with the dodgy 40A unit but not surprising that a Chinese factory would substitute garbage cheap capacitors even if a good one was specified by the designer. Note too that not many AGM batteries will take 40A charge, 25A stops most. If you can afford it, a nice setup is a Renogy 50A DC-DC Charger with MPPT. It will charge your rear battery from solar panel and/or alternator, and when parked and your rear battery is full, it will charge your start battery and keep it topped up. I have this setup with the two batteries up front wired in parallel for winching, and a third battery in the rear. GU CRD like yours.

I had the same problem and they gave me a full refund.upgraded to atem Australian company 60amp haven’t had a problem since

Kogan 3K W inverter no load. I rang them they didn't care the glue they used caught alight if I wasn't there to unplug it i would have lost my motor home.

User error by the sounds of it, dont blame kings.

Kings garbage.

I’d probably be a little careful. Pretty defamatory video title considering you’re most likely the fault not the product. They’re a legit multi hundred million dollar company and they probably don’t love false accusations. But up to you bro. But Ye 10+ year sparky in large commercial and having wired multiple forbys / Race cars. You’ve undersized you wiring. Insulation and copper is only rated so far, you’ve exceeded it. You can download a Maximum demand calculator or do the maths yourself and work out Cable size that way. Copper is cheap, cars aren’t.