A word to the wise;
1 ground may be ok to run.
2 grounds will definitely let you know where the problem is - both
grounds will conduct high current and create damage.
Cables that go thru holes (lift, motor leads) can be a source of
trouble.
...Walt
-----Original Message-----
From: elec-trak-bounces cosmos phy tufts edu
[mailto:elec-trak-bounces cosmos phy tufts edu] On Behalf Of Christopher
Zach
Sent: Wednesday, April 28, 2010 10:23 AM
To: Bill Alburty
Cc: elec-trak cosmos phy tufts edu
Subject: Re: (ET) sparks!
Interesting. I too have a ground fault on my tractor; in my case it's
inside the motor itself.
I'm guessing the root problem is that dust from the brushes has built up
and is now conducting to the case. It's not the field, it's the armature
and it is annoying.
One of these days I will drop the motor, take it apart, and clean it
out.
Chris
Bill Alburty wrote:
Thon, I was surprised to see your post because I had the same
experience plus some excitement here with my E-12 tonight!. While
removing the nuts and bolts to get the right side panel off, I had to
partially remove the charger cage and accidentally scraped it
(actually the resistors strips) on the chassis. Even though the main
disconnect and the key were off, it took off in reverse and I had to
jump on and ride it and figure out how to stop it. Fortunately it
didn't run into anything. When I jiggled the charger cage it stopped
and I saw that the R1 strap was burnt in two. I've know for a long
time that I have a ground fault but haven't tried real hard to fix it.
The charger cage has had 13 volts on it for some time and I use a
piece of wood to insulate the mounting screw.
Someone said a likely place for the ground fault is in the lift motor.
I've got a replacement for the R1 resistor, so I'll see if that fixes
it tomorrow. Our problems are similar. I would say your charger cage
has a voltage on it and if its not insulated from the frame, the frame
is hot also. Good luck fixing it.
Bill Alburty E-12 Kansas
tbamc wrote:
While looking into my sporadic working forward gears problem I
disconnected the neg. battery terminal closest to the charger. When
hooking it back up I managed to scrape it across the cage over the
charger and got a decent sized spark. Main disconnect and key, were
off.
Does this mean I've got a ground fault I need to find? :-)
Thanks.
Thon
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