<div dir="ltr"><div dir="ltr">Cecil:<div><br></div><div>"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."</div><div><br></div><div>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.<br></div><div><br></div><div>Steve O.</div></div><br><div class="gmail_quote"><div dir="ltr">On Thu, Jan 17, 2019 at 12:00 AM Cecil Bearden <<a href="mailto:crbearden@copper.net">crbearden@copper.net</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div bgcolor="#FFFFFF">
<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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