RE: (ET) E20 Speed 8 broken

["Markus Lorch" <mlorch vt edu>]

Chris and Rhett,

thanks for the replies. The ground fault is what I checked
first as this seemed a likely problem to me as well. While
I have a potential difference between the battery posts
(I think I checked multiple) and the frame, there is virtually
no current flowing between batteries and the frame. 

I'll double check these. I had measured the resistor's 
resistance (card connector 6 disconnected) and it seemed
ok. I will double check these items though next time I have
some quality time with my E20. 

Markus

> -----Original Message-----
> From: elec-trak-bounces cosmos phy tufts edu 
> [mailto:elec-trak-bounces cosmos phy tufts edu] On Behalf Of 
> Christopher Zach
> Sent: Dienstag, 18. Januar 2005 10:35
> To: Rhett George
> Cc: elec-trak cosmos phy tufts edu
> Subject: Re: (ET) E20 Speed 8 broken
> 
> 
> Another possibility is a double ground fault. It's quite 
> possible that 
> one of his wires on the main power has rubbed thru to ground, and the 
> tag wire going to FW8 resistor has also gone to ground. Everything is 
> great till he hits speed 8, at which time it blows the fuse.
> 
> Check to see if there is any voltage between any of the 
> battery points 
> and the frame when the tractor is running, motor on, speed 5.
> 
> Chris
> Rhett George wrote:
> >  - Greetings -
> > 
> > Marcus Lorch has an E20 which is teasing him with an 
> uncommon problem,
> > that of blowing the control section fuse in Speed 8.  Here 
> are two guesses,
> > best I can do without seeing the tractor.  First is that 
> the connection
> > from the microswitch to the resistor has shorted to ground 
> where it passes
> > from the control box to inside the console.  Second guess 
> is that the 
> > FW resistor has open-circuited.
> > 
> > Marcus, please let us know what you find out.
> > 
> >                                             Rhett
> > 
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