The truck was manufactured by Linde for Baker. It was probably the most popular selling 3 wheeler on the market and pretty easy to work on.
There are are a total of 4 directional contactors. I would say that you still have a problem with the steering switches or associated wiring.
The pump motor circuit is direct battery voltage. You either have a direct short or the contactors are stuck on.
I would think that your local Linde dealer can troubleshoot and fix this truck very quickly.
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