It's on the Port side of the engine. Just above the oil filter. There are some electric connetors bolted at the same time.
It's held on the engine by 2 metric 6 bolts, use a 10mm wrench.
Partnumber 893640T01
SOURCE: mercury outboard over charging
Your motor is fine. It needs to put out more than 12 volts or the battery will not charge. Most alternators put out between 13 - 17 volts, so this is well within the range.
SOURCE: 1999 Mercury Mariner 9.9hp outboard motor
should be on the side with a lever but could you give me more info please
SOURCE: impeller replacing on 1999 merc. 25hp 2 stroke
Should not be that hard. Tape up the ends so you can hold it with out getting cut, (if its ragged or sharp from damage). should be one nut holding the impeller on. If its to tight to hold try air or electric Impact wrench. If its bad you can tap with a hammer to help in removing the old one. If it turned on the shaft you will need to rent a puller. Repost if you need more help.
SOURCE: Free wiring diagram for 1978 Mercury Outboard 115 HP boat motor
I have a maintainance manual for this engine (I have the same one) with pages of wiring diagrams. What specific system/area are you interested in, I could scan in the page(s) and email them to you.
Mark
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