alandav123
New member
Hi all, as some of you may have read I had a near sinking.... so the alternator & starter are off and there was not really any other wiring to speak of other than up to the dashboard, and gauges.
My question is this ..on an engine such as mine a Mercedes OM352 marine diesel 120HP what exactly is it that determines whether its 12 v or 24 volt?
Is it the alternators output which in my case puts out about 26 volts at half revs?
When I did a direct jump start by-passing the solenoid to get the engine running again today I did notice a huge spark at the alternator so much so that it crossed my mind as to whether or not the starter was 12 volt or 24volt.
There is a mercedes dash board fascia which looks origonal and I understand its 24 volts also.
Point is..... would I make life easier in the very long run by changing out or refurbing the alternator/starter for 12 volters and make everything 12 volt OR is there some other reason to keep it all 24v.
Perhaps the starter needs to be 24 volts as its a 6.0 litre engine with a reasonable compression ratio and takes some spinning over.
Or maybe the oil pressure switch, temp sender, engine hours counter, dead man solenoid, etc are all 24 volts so a change-over is not feesable, I just wanted to make a good choice while all the units are removed from the block.
Theres a seller on ebay with a new 12 volt bosch starter for an OM352 asking £65.... I would be way over that amount to get a re furb done....do you see where I am going with this?
Its a times like these that I really wish I had learnt more about electrics...mechanics is my game as I can see everything.......electricity is invisble to me.
Regards Alan
My question is this ..on an engine such as mine a Mercedes OM352 marine diesel 120HP what exactly is it that determines whether its 12 v or 24 volt?
Is it the alternators output which in my case puts out about 26 volts at half revs?
When I did a direct jump start by-passing the solenoid to get the engine running again today I did notice a huge spark at the alternator so much so that it crossed my mind as to whether or not the starter was 12 volt or 24volt.
There is a mercedes dash board fascia which looks origonal and I understand its 24 volts also.
Point is..... would I make life easier in the very long run by changing out or refurbing the alternator/starter for 12 volters and make everything 12 volt OR is there some other reason to keep it all 24v.
Perhaps the starter needs to be 24 volts as its a 6.0 litre engine with a reasonable compression ratio and takes some spinning over.
Or maybe the oil pressure switch, temp sender, engine hours counter, dead man solenoid, etc are all 24 volts so a change-over is not feesable, I just wanted to make a good choice while all the units are removed from the block.
Theres a seller on ebay with a new 12 volt bosch starter for an OM352 asking £65.... I would be way over that amount to get a re furb done....do you see where I am going with this?
Its a times like these that I really wish I had learnt more about electrics...mechanics is my game as I can see everything.......electricity is invisble to me.
Regards Alan
