Issue 1- When removing the cowl i found that a wire in a wire harness (believe it is an emissions control unit) apparently shorted out or the insulation rotted and caused a short.Issue 2- I found a bolt and washer in the bottom of the unit.
Mercury 25 Hp Efi Manual Or BuyI suspect it came loose I need to find a manual or buy one to identify this hardware correctly The fuel line did cause the issue with fuel flow, not sure if that cause the short with the emissions harness.I want to post some photos so you can share some ideas that contributed to the short. But I might change the VR now as a precaution andor make sure the harness is properly connected first. If the bolt is for the harness; a loose connection motor side can also cuse heat. I have some mud dobbers nest that left sediment in the engine compartment. It is pure instinct that leads me to believe someone cranked the hell out of the motor and overheated the wire. Put the cover of the engine in the truck and run no cover slow n dry freshwater awhile and verify the harness it not warmhot. Is this the voltage regulator rectifier Starter Motor Rectifier for Mercury Mariner (25 30 Jet 25 Efi 3 Cylinder 4-Stroke) Engine Part number 17 I actually ordered the harness with amazon, because i had some 200.00 bucks in points. I have had the vr fail on a Merc 50, but it had a service campaign for overheating as it sat on the em. When you call these guys, ask if there are any service campaigns on the engine. Sometimes an existing problem with the engines is discovered. They dont pay the bill, but correct the issue in revised parts. It could be cause by corrosion at the contact and the new harness wont fix that issue. Boat Design Net does not necessarily endorse nor share the view of each individual post. When making potentially dangerous or financial decisions, always employ and consult appropriate professionals.
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