2007 305/350 MerCruiser engine with Bravo 3. The engine port side sits a bank of 4 20amp mini fuses 2 sets of the wires leading to that fuse bank are heating up and one of the 2 melted the fuse holder for that bank. I believe the two sets of wires that are heating up have something to do with the ignition circuit and possibly other one something to do with the alternator. The other two 20 amp fuses that are also sharing that bank of 4 at least one of them is for the fuel pump I believe which I'm not having any issues with any of those wires heating up. I cut those four wires out and spliced them into 2 new independent marine fuse holders and still noticed both of those sets of wires are still heating up one getting much hotter than the other. The wire that gets hotter than the other has to do with something like I said with the ignition if I pulled the fuse while engine running it still runs but I won't be able to crank it it'll just click until I put that fuse back in. I cleaned and replaced both eyelet wire connectors on the alternator (ground and positive) to rule that out. I already replacemend the 50amp circuit breaker that sits behind the horn in the center of the engine (between the bank of three relays and the fuse holder that I'm having issues with. I'm not sure what else to check I do know they are definitely pink wires one has pink and purple stripe that leads to a thicker red with purple stripe wire on other side of fuse. And I believe the second wire that's also heating up is a pink with green stripe that leads to a thicker red with purple wire on the other side of the fuse. Hoping someone could share some input to wear these wires go and what their suggestion might be for the reason why these wires are heating up and sometimes melting the fuse.
Could it be something with the key ignition switch at the helm.. perhaps dirty connections there? Or possibly one of those relays going bad? Or maybe somewhere attached to the starter possible corrosion with the wires down there? Keep in mind those pink wires are thin possibly 18 gauge. Also please keep in mind I have a Mercruiser Smartcraft system. I keep my engine very clean if that helps.
Could it be something with the key ignition switch at the helm.. perhaps dirty connections there? Or possibly one of those relays going bad? Or maybe somewhere attached to the starter possible corrosion with the wires down there? Keep in mind those pink wires are thin possibly 18 gauge. Also please keep in mind I have a Mercruiser Smartcraft system. I keep my engine very clean if that helps.
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