My first spindle (water cooled, 1.5kW, ER11) had a issue with the bearings (it would scream about about 13,000rpm). I'm installing the replacement spindle (water cooled, 1.5kw, ER16) and I've discovered that all 4 pins are grounded. I've told the supplier and expect them to help, but I've already waited 6 weeks for the replacement to arrive and don't want to wait that much again. Has anyone experienced this issue and/or can anyone give advice on something simple I could look for to fix this?

Thanks,
Allistar.