Alternator charge regulator 24 volt on a 12 volt system ?

Question

Hi all,
I had a breakdown today where a large diesel generator shut down due to flat battery as charge alternator had failed I didnt have a replacement unit at hand and the only thing I could find left in my van was an old tatty lucas regulator which I didnt know if it was 12 or 24 volt as the info had rubbed off with an irate customer breathing down my neck and maybe several hours trek to the depot for a new spare I fitted the part I had which i think was 24 volt ?
Fitted and boosted the battery and charge alternator worked quick flash charged at 14 volts and then dropped to 13.5 volts its charging and allowing the machine to run
Question is whats the difference inside the regulator resistance ?
Is this going to fail premature or stress the worn alternator to fail on another fault ?
Going to get replacement part tomorrow to renew later in day to keep customer happy
Scratting around at home in the garage toolbox of spares I found another regulator which states 12 volt so I definatley fitted a 24 volt to 12 volt system but it works
Is the best voltage its going charge at 13.5 due to its design ? I assume 2 x 13.5 = 27 volt ?

Not a sparky so thought I would ask on here

Cheers for replys

Answer 1

Can you explain why or how a diesel engine broke down because the starting battery went flat

Answer 2

The alternator will be trying to get the battery up to 25 volts, either it or the battery will be damaged

Consider taking a new alternator and battery when you go back, as well as a new regulator, does the irate customer really want tatty old bits?

If you need advice here think if your knowledge qualifies you to service generators.

Answer 3

Hay Sparky you can not run a 24 volt regulator on a 12 volt system, it ain't gonna work.

You should read over what you write before you send it, read the words not what you think you said.

Answer 4

yes