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Re: (ET) ok, not the fusible link
Likely it was a wire that smoked. Feel the small wires to see if the
insulation is relatively supple or harder - carbonized - had been heated
to the point of smoke. somewhere on the 'load' side of a wire like that
you should find a short circuit or fused relay contacts, fused in other
than their normal relationship.
Dave
Weymouth MA
On Sat, 29 Jul 2006 21:08:18 -0400 (EDT) Michael S Briggs
<msbriggs alberti unh edu> writes:
>
> RJ,
> Mine's an AA.
> An update on what I've looked over:
> Since the fuel gauge wasn't showing anything, I decided to
> try
> tracking the path around it to see where the path was broken. From
> the
> positive end of the pack to the fuel gauge was fine, the problem was
> on
> the end from the - end of the pack to the fuel gauge. The path was
> fine to
> the fuse holder, and fine from the fuel gauge to the side of the
> fuse
> holder closest to it. So, that would seem to indicate blown fuse -
> but the
> fuse was fine. What I ended up finding was that with the fuse in the
> fuse
> holder, it had no connection to the screw terminal where the wires
> connect.
> I tried just cleaning everything out well, filing off any
> possible
> rust, and then sprayed it down with De-Oxit cleaner, but still
> nothing.
> The rivet connection where the fuse holder is connected to
> the
> plate that the screw is on (where the wires connect) was loose and
> wobbly,
> apparently not making a good connection. The other fuse holders
> looked
> nice and tight at that rivet, but not this one - so I figured maybe
> I had
> somehow weakened the rivet when I pulled out the blown fuse to
> replace it.
> So, I figured I'd try soldering that connection to make a
> better
> contact between the fuse holder and the screwed in connections. That
> may
> not have been a great idea (that block with the fuse holders
> connected
> doesn't seem to like the heat), but it did at least get it where now
> when
> I engage the power disconnect, I do get a reading on the fuel meter
> gauge
> - but it was much lower than it should have been, and still nothing
> works
> - no drive motor, no PTO, etc..
> So, for the time being I pushed the tractor back into the
> garage
> (man that thing is heavy - especially when you're pushing it up a
> hill).
> Got a good workout though. :)
> It may just be that the fuel gauge is reading low due to
> some
> additional resistance somewhere in the path (perhaps at the fuse
> holder),
> but I'm also suspicious that the pack may have been slowly
> discharging
> through some short somewhere - so I disconnected the negative-most
> battery
> terminal.
> Apparently something other than just the fuse did blow, I
> just
> need to figure out what. What could cause this symptom of no power
> to
> anything? The fuel gauge meter was showing nothing also, until I
> tried
> soldering that fuse holder connection - but perhaps I shouldn't have
> done
> that. When I then decided to check the resistance between the fuses
> themselves and the wires connected to the terminals on the
> fuseholders for
> the other two fuses, they also seem to have no connection (between
> the
> fuse and the screws on the fuse block) - don't know if they were
> like that
> initially, if they're supposed to be that way, or if I screwed
> something
> up when soldering that one fuse block.
>
> Thanks,
> Mike
>
> --
>
> --------------------------------------------------------------
> Michael S. Briggs
> UNH Physics Department
> (603) 862-2828
> ---------------------------------------------------------------
>
> On Sat, 29 Jul 2006, RJ Kanary wrote:
>
> > Once again, I will ask what flavor of E-15 you have. Since they
> have three
> > different wiring configurations, knowing which revision yours is,
> {AA, BA and
> > so on.} would help me help you. The pertinent information is on
> the data
> > plate under the hood.
> > Thanks.
> >
> > ----- Original Message ----- From: "Michael S Briggs"
> > <msbriggs alberti unh edu>
> > To: <elec-trak cosmos phy tufts edu>
> > Sent: Saturday, July 29, 2006 4:08 PM
> > Subject: (ET) ok, not the fusible link
> >
> >
> >>
> >> Found a post from Wombat in the archives saying where the fusible
> link is
> >> - just a wire going across two terminals on the Power Disconnect.
> Ok, so
> >> the fusible link is fine, so it's apparnetly something else.
> >> Based on the wisps of smoke that came up around the speed lever,
> >> it seems reasonable to suspect something underneath it may have
> blown.
> >> There's that big ol relay down underneath there - but that's just
> the PTO
> >> contactor. Unless it's failure mode is creating a short across
> the
> >> batteries, I can't see that being the problem, since it's not
> just the PTO
> >> that's not working - nothing is.
> >> I suppose the smoke could have come from something in the speed
> >> control itself, but that shouldn't cause the no power at all
> problem (at
> >> least from looking at the schematics, I don't think it should).
> >> From looking at the Troubleshooting sketch schematic for the
> E-15
> >> in the manual, and just looking at what might result in the fuel
> level
> >> gauge not seeing squat, the only things between the fuel level
> gauge and
> >> the batteries (so the only things that keep it from reading batt
> voltage)
> >> are:
> >> 1. Power Use gauge - checked it with the multimeter, it's fine.
> >> 2. 20 Amp fuse 3 - it blew initially, I replaced it with 20 amp
> light fuse
> >> for the moment.
> >> 3. Wire 13 goes from that fuse to the PTO coil (is this the PTO
> contactor?
> >> Or some other coil?), but you don't seem to need to have a
> connection
> >> THROUGH the coil for the fuel gauge, since line 13 comes off of
> that same
> >> connection point on the terminal, and continues to the fuel gauge
> - on the
> >> negative side of it.
> >> 4. Line 5 comes off the + side of the fuel gauge, goes to fuse 2
> (the lift
> >> fuse, but doesn't go through it, just connects to one end of it,
> and
> >> continues on from that same connection point), continues to the L
> >> contactor, but not through it, and to circuit breaker 1. Hm,
> haven't
> >> checked that yet - isn't that the main circuit breaker on the
> back of the
> >> panel that has the forward/reverse relay and such on it? I
> pressed it to
> >> reset in case it was the issue, but it seemed to be fine. I'll
> check again
> >> in a minute just in case.
> >> 5. Power Disconnect, which presumably doesn't itself fail in any
> way -
> >> I'll check though.
> >> 6. Fusible link - fine.
> >> 7. And then to the + side of the pack.
> >>
> >> So, presumably something in there is failed. I'll head back out
> with my
> >> multimeter and trace the line all around.
> >> This is kinda fun, albeit somewhat frustrating, since I had
> other
> >> things I wanted to do.
> >>
> >> Mike
> >>
> >> --
> >>
> >> --------------------------------------------------------------
> >> Michael S. Briggs
> >> UNH Physics Department
> >> (603) 862-2828
> >> ---------------------------------------------------------------
> >>
> >> _______________________________________________
> >> Elec-trak mailing list
> >> Elec-trak cosmos phy tufts edu
> >> https://cosmos.phy.tufts.edu/mailman/listinfo/elec-trak
> >>
> >
>
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