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    4.3 blows 15a fuse when you throttle up

    Boat idles fine and those rpms were engaged with throttle engaged in forward gear. Still though, why blow that fuse 5 times in a row on the lake but not in the driveway? And why no energy fluctuations as rpms increased? You would think that if that fuse blows repeatedly on the water, then...
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    4.3 blows 15a fuse when you throttle up

    About 4000 rpm. Kept it there for about 20-30 seconds at a time but wasnt sure that the muffs supply enough water to allow that without burning something up after a prologued duration. With throttle fully applied there must be some kind of limit or governor because it waffles between 3900 and...
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    4.3 blows 15a fuse when you throttle up

    Consequently the fuse would not blow in the driveway at full rpm with muffs on. Thanks for everyones help!
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    4.3 blows 15a fuse when you throttle up

    So here are some electrical readings I took. May not be helpful at all but i figured I would post them. The voltage over the alternator posts is a consistent 14.4v when running even with increased rpms. I measured amps over the 15 amp fuse and it went from around 4 to a little over 6 as we went...
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    4.3 blows 15a fuse when you throttle up

    But one other thought on the TKS that was brought up before.... this boat would “diesel” after you turn the key off most of last year. We would have to wait 20 sec or so before the kids could jump in the water for fear the motor wasn’t completely off. I wonder if the TKS diode is going bad as...
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    4.3 blows 15a fuse when you throttle up

    Going to borrow a set of muffs and test alternator on the trailer sometime in next couple days. My mechanic thinks that is what to test next as well. The reason I will do it first in the driveway is that our house is both 15 miles from our mechanic and the lake!
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    4.3 blows 15a fuse when you throttle up

    Here are better pics both wires appear to be red with purple stripe. This is the closest fuse to the multi pin plug
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    4.3 blows 15a fuse when you throttle up

    Reading on tks now. Maybe that diode is bad. There is a service bulletin on that. Reading on it now......
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    4.3 blows 15a fuse when you throttle up

    Here is the fuse and the serial number. The harness was purchased from a dealer who matched it to the engine serial number. My mechanic is very well respected and I believe will figure it out but its one of those frustrating trial and error issues. He thinks the alternator may be overcharging...
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    4.3 blows 15a fuse when you throttle up

    Its not the main 50a breaker. Its one of those watertight fuse holders in line. The harness is oem from Mercury as was the starter we replaced. From the factory it contains a 15a fuse. On the old wiring harness, which someone obviously messed with to deal with this gremiln, they patched in a...
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    4.3 blows 15a fuse when you throttle up

    My 2007 Tahoe boat has a 4.3 Mercruiser carbureted engine. The engine is newer, maybe 6-7 years old and the harness is brand new. The old harness had a breaker wired in where this one has a fuse. The fuse is a 15a and is on the red wire with purple stripe on the top of the engine. Is this the...
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