I am having a starting problem with my 1800. Basically when I push the starter button the starter will begin to turn and then nothing. Sounds like a weak battery but I checked it and it load tests fine. Battery has a good 13.2 volts on it and was fully charged. Ground is good (cleaned and tightened everything). The fuel pump is charging fine. If I had to guess I would say I need to clean the starter switch, but I have not experienced this type of switch failure before. Anything else I should check?