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

[Stephen Offiler]

Cecil:

"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."

According to this schematic, the regulator is powered and sensing off a
separate diode trio (separate from the main rectifier) via the D+ line.
The D+ connection typically goes to a dash warning light.  The regulator
has no connection to either B+ or W.  You know what B+ is.  W is an AC
signal output, which one random web references calls "Waveform" possibly
used for diagnostics or a tachometer.

Steve O.

On Thu, Jan 17, 2019 at 12:00 AM Cecil Bearden <crbearden at copper.net> wrote:

> 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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