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Power that turns ON the ECM is from splice 100 coming from the key switch to pin J1

That's a 555 ECM The MPR is turned ON by the ECM applying a ground

No trick, they either loosen or they don't. Use a 6 point socket and a breaker bar. You could try warming the motor up to see if that helps

Correct

Those are casing numbers, Merc serial number would be something like 0M123456. If there it would be a plate just above the starter. Post a pic of the ECM so we know what vintage it is

Agree, need a serial number If its a MEFI then options are greater

Spin on is better, but the wix filter replaces the original OEM

Looked up a drive and its showing .105 thickness Item 13 https://www.mercruiserparts.com/bam/subassembly/30854/1595/50

There is something miswired or something is wrong the the Petronix. Don't like the Pet but when it does work there is no issues It melted the wire but didn't blow the 20 amp in line fuse under the helm, doesn't make sence

Don't know of any spec, it just should not have side play. Maybe @Bt Doctur will have a better answer

Note: the B3X, is a Bravo X upper and standard B3 lower. The X part is only the upper section. If your going to try and use it next season, clean it up and put some JB weld on it to help keep water out. Best to just replace it now

Guess I should have said making measurements on the other side to make a mold on the damaged side

First, boat is in the water and your adding a patch on the inside, so while it may hold for a while it will not hold long. If a patch is put on the outside (Temp pool patch or other) to stop the water coming in, then maybe something can be done on the inside. As with any kind of adhesive, its...

That is a tough one, is it worth fixing, or sell the parts and find another Back to your question: Could make a template from the other side, build a mold and lay glass on the inside. Some folks on OSO do this kind of stuff a lot and might get some ideas from them Like this one...

Sounds like you have tracked the issue as far as it can. Was hoping with all the folks who has looked at the thread they might offer some insight I'm unable to find a Johnson diagram for your model but the Merc works the same, may just be different color wires. When the Magneto is grounded...

Look for Wix 33094 Best route is change the thing out for a spin on canister filter

Going to need to measure but looks like it might work, The link below will show what the 3.0 is which should put up close https://www.mercurymarine.com/en/us/documents/installation-drawings/

Yes, with key in the OFF position the black/yellow should show zero ohms to ground. If its not then check your key switch Key should have a black yellow on a terminal and a black on another terminal. When the key is OFF the switch should connect the blk/yel to blk terminals. The blk terminal...

Might just be a head gasket.

Most all single engine cruisers list to starboard (mine also). The head is on the starboard side and the water tank is on the port side. If the water tank is filled, this helps right things a bit, but may not do it all. I don't worry about it, trim tabs flattens things while running Edit...