From: "Kleinbrahm, Robert" <rkleinbrahm firstrepublic com>
To: <elec-trak cosmos phy tufts edu>
Subject: (ET) Alltrax E20 question.
Date: Mon, 19 Jun 2006 17:00:48 -0700
I am in the process of installing the third controller on my E-20
tractor. The first two units smoked on me and I am very concerned that
I have something wired wrong. In the process of tracing back all my
wiring, both newly installed and current, I discovered what seems to be
an anomaly with my pto switch. If I am reading the alltrax wiring
diagram properly the key switch has to be made, before power will be at
the pto switch. From my E20 schematic I find this wire to be labled #15
which feeds through the pto switch. Now the interesting thing is that
on my tractor when I check continuity through the pto switch from pto
coil #27 and #15, I am hot, even with the main key switch turned off.
This is very perplexing in that both the alltrax schematic and the ET
both show the key switch having to be on, before power is supplied
through the pto switch. I haven't done any rewiring of the dashboard
switches as I am reusing all the original connectors and dash wiring for
this conversion. On my last attempted controller unit, it fried when I
hit the PTO switch and I am concerned that I am picking up power to it,
even with the key switch off. I have discovered that if I wire the #15
from the key switch to one side of the reverse & throttle switches
without going to the pto switch, as the alltrax schematic shows, I am
able to make the pto behave normally. In-other-words, if I have the key
switch off the pto switch is also off, but if I turn key on, then the
pto will work properly. My tractor does not have a seat or brake
switches and everything else seems to be stock. What am I missing,
should the pto switch indeed be hot with the key off?
Thanks,
Bob K.
Robert Kleinbrahm
Senior Network Engineer
First Republic Bank
San Francisco, CA. 94111
415 288-1478
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