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No. they are two separate "banks" although there is only one battery in each bank. When they are not being charged the house bank is being drawn down while the starter is untouched. Two years is not very long. How much you use the system determines how robust it needs to be. A weekend warrior...

Matching your batteries will do nothing to extend their life. You only match batteries when they are part of the same bank. You have a starter battery and a house battery. Your house battery should be deep cycle for long life, a starter battery will not stand up to long slow deep discharges as...

yes sold and off to a new adventure

It is not the charging that will damage the trailer battery (although you will have to address the voltage drop) Using a starter battery as a house battery, depleting it and not immediately recharging it will shorten it's life dramatically. Get a true deep cycle for the trailer, a pair of 6V...

A charge controller set to the correct voltage profile will not cook batteries. While using the same battery in the trailer and as a starter might seem like a good idea, you have two opposite battery needs, starter and deep cycle. No matter what the salesman says there is no lead acid battery...

You either have a parasitic draw on the vehicle side or that starter battery is done, 12.1V is a dead battery

Probably unrelated to your issue, but I would rather see your loads coming off the house battery (through a fuse block).

Our MB 917AF had a GVW of 9400kg. The most restrictive thing about the truck was height. White rim was not accessible because of rock overhangs in a few spots. We crossed some pretty dicey wood bridges in south America but only after being assured by locals that heavier vehicles used the same...

Although this might seem like a good idea, I think it's a bad one. Trickle charging a starter battery can disguise a battery not holding it's charge. When a battery goes bad it usually gives warning with slow cranks.

A MERCEDES TRUCK! Not a G wagon, not a Mog 9400Kg 13 mpg 2000km range (yes that is correct) Full time 4X4 locking center rear and front diffs.

No I'm talking Mercedes truck, Your looking for MB 1017AF for example the first two digits are the chassis GVW in 1000kgs and the second pair are engine hp rating in 10's of hp. The A is all wheel drive(full time 4X4) the F is a firetruck designation. Look for chassis weight between 9 and 18...

Have you considered a Mercedes 4x4 truck rather than the Mog? Better fuel mileage, nicer ride and not a huge difference off road.

Selling less than $100K Charlie?

I think you are looking for a unicorn. The 100k budget means used. Stop looking at unimogs, the only Mog that fits your needs is the U500 and for 100k you will be lucky to find a bare chassis. Your choices boil down to a domestic HD PU or a MB or Man import. The two German imports are far better...

The trans Labrador is now fully paved and although remote it is frequently travelled. We carried an In Reach.

I am wondering if there is a valve stopping the brake canisters from releasing the springs. Dumping all the air from the tanks won't help because the valve stops the air loss from the canister. I am only guessing here, see if you can find a schematic of the air system.

The spring brakes should engage/release somewhere around 3-4 Bar. The red air warning light comes on just before the spring brakes engage. When driving you should be constantly scanning that gauge. When you air up with the parking lever released you should hear the rear springs being compressed...

The fact that it sometimes takes minutes for the spring brake valve to release air is concerning, it should be instant. The fact that dumping all the air does not engage the spring brakes rules that out as the problem, but it needs to be looked at. Do you routinely dump air from the wet tank...

BTW the alternator is 200 Amp 24 V. Don't forget to grease it when you do your routine service, also there is a grease cup on top of the transmission that needs regular attention.

The "parking brake" is the spring brake. It engages when there is no pressure to the spring brake side of the canister. It is a massive spring that is held back by air pressure. when you stop and engage the spring brake you hear the sudden air escape from the spring brake chamber, this pushes...