Had my 99 Max for a few years now. It came with an On/Off Boost switch on the switchgear but this has now seized. I have taken it off to look at the wires to see if there was just two then I could connect or disconnect so that the V Boost runs as normal. There are, however, four wires (as pictured). The V Boost whirrs as per when switching on but seems to be off at 6000 revs plus. Any ideas what wires to connect ? Cheers.