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<p>To update the VC problem, after measuring the voltages and
looking at diagrams again I am beginning to understand the system,
but I don't understand the reasoning behind it. In a nutshell,
the alternator charges the main battery, at the same time the VC
charges both batteries in series at 24V. Definitely something
lost in translation in their engineering. <br>
</p>
<p>All I can think is What the H*#L ?!?!?!?<br>
I have found a 24V alternator of the same size and connections. <br>
<br>
Cecil<br>
</p>
<div class="moz-cite-prefix">On 1/16/2019 10:59 PM, Cecil Bearden
wrote:<br>
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<p>Guys:</p>
<p>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. <br>
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.<br>
</p>
<p>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..</p>
<p>Cecil<br>
</p>
<p><br>
</p>
<p><br>
</p>
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