For $100, i'd be just as happy to have it 'not work' and sit in the corner looking good 

With everyone here to jump in, it should be running upto spec in no time 

You may want to quickly de-solder the wires off the bumper coils, which will give you more time to measure voltages and so on, without blowing fuses.

I guess the Trannies (as MartyJ said) will be suspect, otherwise the bumpers are damgaged (or well on their way).
I'd also be feeling how easily the plunger moves within the bumper coil-sleeve etc etc..

MM.