I've recently developed a problem with burning the ignition switch fuse when I try to crank the engine over.<br /><br />Engine/Ignition info: 1987 Volvo Penta AQ-260 (GM 350) with a three position key switch (Off,Run,Start). The engine was rebuilt last year. The starter and the switch are only a year old.<br /><br />The odd thing is that it doesn't do it every time I start the engine. But sometimes I go through a whole box of fuses before I can get it going. My initial thoughts are faulty ignition switch or a dead spot in the starter that is causing it to draw high amperage.<br /><br />I need your help with ideas that could cause the fuse to pop, and help with testing the switch and starter. I have a multimeter but am far from proficient at using it.