Jack- your TM is older than mine but I'd check the fuse off the battery. I don't think your inverter should be in the circuit on 12V DC. If the water pump works when you're plugged in, then the inverter is working fine because the pump is 12V DC (my pump just died and it's a 2008 but I digress....
The fuse they used off the battery in mine is an in-line fuse off of the positive battery lead. It's a small red plastic housing with a metal fuse stuck in it. Hopefully someone with the same vintage TM will have better info.
One thing you might do is check the voltage across the battery when you're plugged in. It should be about 13.4 or so volts if the inverter is working (which I think it is).
Something in the DC circuit from the battery is simply not connected ergo the fuse suggestion.
Good luck.
Phil
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