I have a 2000 Mercruiser 4.3L that has a bad slave solenoid. It will activate (click) when key is turned but won’t close the contacts to send power to the starter solenoid. It is relatively new so I disassembled it thinking the contacts might be burned. Instead everything was clean inside. After reassembling I bench tested it off of my 18 volt cordless drill battery and it activates, closes the contacts and I have continuity. Back in the boat it will trigger (click) but not close the contacts. I loosened the main lugs and dropped them less than 1/16” so they were closer to the copper disc and it works perfect every time. Why would the solenoid travel be too short on a 12V battery but okay with 18V ? Appreciate any help on this. Thanks
