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I picked up an optocoupler from the nearby supplier, soldered it in, powered up the controller, and as the precharge time expired, the contactor clicked closed! It was working again! However the mosfet Q1 was getting hot, so back to the store to get a replacement.
They did not have the exact part, but assured me that an IRF5210, a P-Channel 100v 40A MosFET would work just as well. And it did work, activating the contactor just like it used to before the problems. It stays cool to the touch as well.
I will reassemble and test it in the car a little later on. Maybe I should put a diode accross the coil -- I will check what they say on their website first.
Amin
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