200 amp gen charge 14 v?

[Dsc45shooter]

Ive read a lot of confusing posts about this. I plan on running a strobe lightbar, siren, and radio off the rear 12 battery and read about running a wire from the front of the regulator marked 15v to the same rear battery for individual charging. Problem is, it doesnt put out 15v when checked while running. Is this even possible?

 

[tim292stro]

Probably better off with a larger 24V alternator and a Vanner charging a separate 12V battery for the 12V only loads.

 

[DatGuyC]

I could be wrong but I think i remember reading that the converter has to sense a load before it starts outputting the +14v.

 

[86humv]

Check for voltage at that battery with truck off...record it.
Start truck with that 14v tap hooked up....with truck running, s/b more voltage if reg. is good.

 

[donkren]

Apparently there are multiple 200A alternators, but if you have a 15v terminal you must have dual voltage capability. Per the TM and manufacturer, my Niehoff N1225-1 alternator with a N3135 regulator can be used as single (28V only) or dual voltage. It has a "14V" terminal that should either be grounded when used as single voltage or connected with 8ga wire to the middle jumper between your batteries for dual voltage. The 14V section has a maximum capacity of 50A and has over voltage cutout.