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Guess I'll just take your word for it, because I don't see how it would be electrical. Your sender bottom appears that the lower plate (Blue arrow) would move with the float going up/down. The gauge pin (yellow arrow) looks like it would cause the gauge to move. Your walmart link was for a...

You can use an ACR so don't have to switch, but then you would also need to move accessories to bat 2. So long as the stereo, fish finder and others are not separated you will always need to move the bat switch to save the start bat

You know when I saw your oil filter adapter I thought automotive and oil cooler lines. After looking deeper, the same thing you have was also used as part of the older remote oil filter adapter. The one which came on the motor (2002 model) was this one When looking at your fist adapter it...

Most the pics in the parts catalogs are not 100% accurate. The longer one goes furthest away from the transom

Agree, and will add, B1, 2 or 3 can be installed on a Bravo upper. There are differences in the cases, so look for which ones your putting together. Also note the ratio

Yours is early enough that the standard 4 port thermostat would be used for multi drain. It shows a check valve after cool fuel but not sure it needs it, even though yours has one before the module. Your cool fuel doesn't have a drain like the early ones, so they have install a Tee (861505)...

Have never removed one, but should be easy enough, just need some hoses. Could use your serial number to verify my thoughts All the items in Green can be removed and plugged. The ones in Blue would be routed to a new thermostat housing except the hose coming up from the drain. The exhaust...

Just found a 3.0 GS A/B/C

Don't have a GSM but do have the GL model. Looking at the GSM parts it should be real close to the GL (EST distributor, carb, alternator). There may be some sensor differences but wiring colors should be the same. If relays do not match up I have some older ones for the GL

Agree, you can make some brackets Found this one at Aqua Stairs I like this one, just search pontoon ladder, about $250

Thanks for the update and good to here your up and running Dead heading a fuel pump should not damage it, Merc even has a test procedure to test the pump by dead heading it to ensure it will reach at least 60 psi. The fuel line is removed from the TBI or MPI fuel rail for the test. Your motor...

The trim lines go from inside to outside the boat, so they go thru the transom. There is more then one seal there depending on if you have a mercathode or not

Was hoping the OMC folks here would help out. I can find things with a number or a pic. There are several here that should know, but not hearing much. If its one like this then it would be like a jabsco Post a pic

While you might have hydrolocked, it might also still be in gear. The Bravo drive does not like to be shifted without the motor turning. Find the slave solenoid inside the box on the port side. Use a jumper to cross the top two large terminals, and at the same time have someone keep pressure...

The B3 drive has maybe twice the amount of heat generated as the B1 or B2. With the lube getting black you need a shower of some type. The lube overheating will create more heat and the next thing to happen is gears break. The heavier the boat the more heat. There is no cooling system that...

This should help, a bit more elaborate then you have but may answer your questions

I think there is a mix up of issues, correct me if in error Volvo Penta uses a diode to power the fuel pump relay, but Merc does not. The Merc 4.3LX power to the fuel pump while running comes from the oil pressure switch (item 3)

Assuming its not EFI or MPI with the newest 14 pin connector It is a Gray wire going from the - side of the coil thru the 10 pin connector on pin 2 and to the tach

That is different, have seen the 3 poles with OFF and the single ON/OFF but not yours. Guess it could just be as its listed, there is on OFF position In any case a 2 bank setup is done to power something else (stereo, other) so power is not used from the start bat. It can be installed so it...

Oil pressure switch should be 805024 or 87-864252A01 (old and new numbers) Oil pressure sensor should be 815425T or 8M0068784 Your electrical parts can be found here https://www.mercruiserparts.com/bam/subassembly/31511/2694/60 Your motor is here...