[AT] OT Buck-Boost convertor for charging auxiliary battery

[Cecil Bearden]

Guys:

I need some help with the wiring on my MTZ 1220.  in an earlier post I 
mentioned that this voltage convertor (VC) will not keep the auxiliary 
battery charged.  The factory furnished a new VC and the dash warning 
light indicates that it cannot keep up with the battery when using the 
lights, or the cab fan.  Perhaps the alternator is not providing enough 
current on the main battery, or the signal from the alternator is not 
triggering the VC to operate.
I have tried to convince the factory to change over to a 24V alternator 
and use one battery for the 12V accessories.   The alternator is an 
ISKRA brand  and a one wire Delco is not easily mounted the way the 
ISKRA is..  The only wiring diagram of the alternator shows a battery 
connection and the sensor connection to the alternator.  The W terminal 
is not shown to be connected in the diagrams I have.   I need to know if 
the ISKRA alternator uses the battery terminal to sense the voltage for 
the regulator as a one wire delco does, or if it need a wire to the W 
terminal to turn the alternator on.   If it uses the Bat terminal then 
changing to 24V won't be a big deal.  If the W terminal or another needs 
the 24V input, then I will have to install a relay to turn on from the 
ignition switch as the ignition switch is on 12V. the starter and the 
glow plugs are 24V.  To change over to the 12V system as the factory has 
suggested, will require changing 6 glow plugs, the starter, alternator, 
and new cables.  My solution only requires changing the alternator.

I know some of you guys are much better at reading electric diagrams 
than I am.   I can usually wire things up without any trouble, but 
sometimes wiring diagrams give me trouble.  If you could take a look at 
the attached, I would certainly appreciate it..

Cecil



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