How low does the voltage go before it won’t start your truck?
Why are you waiting for a jump start? Cos that’s to low ha ha
Lol no just wondering as been told 24.2 was low and I was surprised
Mine’s in the workshop having a new regulator or alternator fitted, it’s had new batteries, but it’s only charging between 25.5 and 26v, that doesn’t leave me enough juice to do a meal in the microwave and run the interior lights and radio for a bit when I park up. We’ve got battery guards fitted, but it kicks in in no time, so I’m getting it sorted now, as the night heater season will soon be upon us.
When can`t boil your kettle and listen to radio 2 at the same time 
I was told that volts is not the problem it’s amps,and how much amperage that is left in the battery
Correct range but voltage and amps are connected as you use amps the volts drop . That’s why if you have a volt meter installed as you start the truck you should see he volts drop as the amps are used up then recharge back up .
Cars battery’s are usually charged back at 14 volts so I’d imagine that a truck should charge back to 28
I use one of these,
ebay.co.uk/itm/12V-24V-Digit … 35f2edb2fb
If it starts getting low when parked up and using power I just run engine for a while
Always park on a hill.
pickandmix:
Lol no just wondering as been told 24.2 was low and I was surprised
if it is fully charged and healthy it should be reading 25.2 - 25.5v before you switch anything on. And then during starting it shouldn’t be dropping below 22v If it is then your battery is either too small, undercharged or knackered.
Is it being charged properly? take a look when the engine is running it should be showing 28ish volts.
Is it knackered at only 24.2 after a good charge? - its ageing!, it may go on for a few years yet or fail tomorrow, the big test will be firing up a cold engine at -10degrees in the winter.
A DAF LF fro example when the voltage hits about 20v it ma not start ,due to the amount of current the starter draws ,the ECU shuts down basically,as they isn’t enough juice for I to do what it needs
A DAF LF fro example when the voltage hits about 20v it ma not start ,due to the amount of current the starter draws ,the ECU shuts down basically,as they isn’t enough juice for I to do what it needs …I may need to check the voltage as it is off the top of my head … Actually had that issue with my car once ,spun over happily ,but no go .RAC came out went on about timing belts ,towed me to my work and I jumped started it .he wouldn’t as he was adamant that the belt was shredded
norb:
A DAF LF fro example when the voltage hits about 20v it ma not start ,due to the amount of current the starter draws ,the ECU shuts down basically,as they isn’t enough juice for I to do what it needs
I’ve had the same on MAN TGX, volt display said 21v but the ECU stopped the ignition after 1 crank or so (i’m sure it would have struggled into life if it had been allowed to)
We just watch what the voltage drop over the DAVIE scren
We just watch what the voltage drop over the DAVIE screen
The scale of voltage at Scania unit ends with 36v. Does it mean that to achieve this I need a stronger battery? It usually shows 25v-26v at R440 unit.
Wilk:
The scale of voltage at Scania unit ends with 36v. Does it mean that to achieve this I need a stronger battery? It usually shows 25v-26v at R440 unit.
if it ever gets up to 36v it probably means your alternator has went very sadly wrong and the batteries are now resembling deep fat frier’s, i would jump out and run.