(ET) More tractor troubleshooting

[Chris Zach <cz alembic crystel com>]

Spent some time working on the tractor today; replaced the gauges with 
new ones; the current gauge still spikes which means a high resistance 
somewhere, and the voltage gauge reads a bit lower than the old one. 
Still they look better.

Also swapped out the lift strap (again) and checked out the contactors. 
Sure enough one of them is shorted, which is why I am missing a speed. 
Unfortunately it's 2A, which is buried under every wire in the tractor. 
Shows 0 resistance at all times, so is probably welded shut.

Next up is to wait for my shipment of parts so I can fix the cruise 
control, seat switch, and all that. Then I'll take these BB600's and see 
if I can get the E15 tractor working again...