[thingstodo]

The fuse was successfully replaced. Only one fuse was blown. The one behind the driver's seat.

The controller still does not work. The 'sound' of the contactors has changed. The error codes have not changed - 16 and 17.

So I checked voltage. After the controller faults, there is 380V from + to - on the pack side of the two contactors up front. So far so good.

Check voltage across the positive contactor. It's 0V? Voltage is all across the negative contactor - it's 380V? It appears that the positive contactor may have failed in the ON position?

That is consistent with blowing the fuse. The 350A fuse actually blows at upwards of 3000 amps in a time of 10 ms. As the current drops (not very much, either) the time to blow the fuse increases. It may have taken 500 ms to blow the fuse - we got acceleration during that 'surge'.

I did not, and do not, EVER expect these fuses to blow unless something has gone VERY VERY wrong. If the Gigavac contactor has welded the contacts, there was definitely a large current flowing when it tried to open.

I guess I need to order some parts from EVTV. 2 Gigavacs to replace these, and 2 more for the WIKISPEED car. I will likely hold off on the DC/DC converters, the orange conduit to hold my #00 cables, etc until I need them.

While I'm waiting for the parts to arrive, I may try to replace the positive gigavac with a Chinese reversing contactor that I had purchased last year for another project. If that does not get the car running again, I'll wait for the parts to arrive.