*From:* Richard "Zack" Zachary <mailto:njcfsa earthlink net>
*To:* Elec-trak list <mailto:elec-trak cosmos phy tufts edu>
*Sent:* Tuesday, March 15, 2005 12:51 PM
*Subject:* (ET) Need diagnositic help on E12
Hi Guys,
<>E-12 went dead again after going only 15 feet in the last
snowfall. Snowthrower still works but no forward or reverse on
the tractor.
This is what has been checked so far:
Both relays close when the key and seat switch are closed (Normal
operating Condition NOC). Between the two contacts on top of
each, 1RTN had 41.0v and 2RTN had 40.9v. They both stayed closed
in both Forward and Reverse.
Then checked between wires # 11 and #14 and got 39.7v in Forward.
Then checked between wires # 11 and #41 and got 39.7v in Reverse.
Then checked between wires #8 and #24 and got 39.7 in both Forward
and Reverse.
This tractor has had some uneven power in both Forward and Reverse
since I bought it 2 years ago . That is, the power felt a bit
uneven and the power needle would sway a little back and forth.
It did stop dead another time when the insulation on one of the
wires from the Varistor got stripped accidentally (when I was
reinstalling the speed control) and this wire probably touched
something else. Have covered the badly insulated spot.
Tested between wires #8 and #7 and got 38.9v in Forward and 38.7v
in Reverse. Got similar results between #8 and #6. That is 39.7
in Forward and 38.6 in Reverse.
Pulled up the cover over the battery charger and inspected the
heavy ribbon resistors. They looked fine front and back and so
did all the connections. I remember that they heated up like a
toaster back when I had the Varistor problem but they look fine now.
Then checked the main connection posts on the motor and they
seemed fine.
<>Got 39.3v across the large connection posts in both in Forward
and Reverse and. Had this motor rebuilt with new bearings and
brushes less than a year ago. Would hope it is still good.
Rotated the motor by hand but no action. Found wire #22 on the
seat switch and wire# 62 on the Varistor assembly. There are
38.6v between them in Forward.
As to current, there is some slight current usage but nothing like
when the toaster was happening.
I am just guessing but could I have burned something out or have a
bad connection somewhere on the Varistor assembly, a diode or
resistor or something like that???
Would appreciate any knowledge you can share,
Thanks,
Richard "Zack" Zachary
E12 model 26AE12CA serial # FP22038
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