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If you are installing a larger alternator, you will need to up-size the cable from the B terminal to the battery Wire colors are standardized as to their function. Check the sticky in the electrical forum for the wire color standard

Back flush the line from the raw water pump to the PS cooler

You should change oil before winter layup Prefill the filter Pull the plugs and crank it until you get oil pressure

Your battery is either toast, or you have bad connections. Changing parts without testing is just burning money

The 470 is a heat-exchaned full system. Other than the one hose to the heat exchanger to drain what did your mechanic do?

So 2018 to 2023 is 5 seasons Oil should have been changed after break-in and 5 more times. Should already be on your 2nd impeller

If you have water in the fluid, your cylinders will be corroding from the inside

If the flywheel key is sheared. It won't run on either or anything else

Ted. It's wired correctly The port side switch is supposed to operate the starboard side and visa versa If you want port side bow down, you press port side switch forward and the starboard side extends, lowering the starboard tab, which lifts the starboard arse and drops the port side bow

use a 2x4 and a helper. lower the master cylinder down to the ground. wrap the two chains around the bottom of the 2x4 and use it as a pry-bar to push in the tongue while your helper cracks the bleeders or buy a mity-vac 8500 so you can vacuum bleed the brakes by yourself. it also comes in...

inrush current on the old direct drive starters on the mercruiser 470 is 57 amps to pull in the solenoid and about 350 amps to get the motor starting to turn. then the solenoid amperage drops to about 5 amps to hold and the motor amperage drops to about 200 amps.

your logic and reasoning is flawed. oil changes are to be every 50 hours or every year, which ever occurs first your boat should be on its 6th oil change if the maintenance was kept up. change the oil and the filter. also, since you are supposed to pull the drive every year to inspect the...

Seriously it the first thread in the forum at the top Here, let me spoon feed you Main sticky https://forums.iboats.com/threads/must-have-technical-information-for-diyers.335378/ Sub link https://forums.iboats.com/threads/miscellaneous-mercruiser-information.323278/ Videos...

Start at the battery and work your way to the helm cleaning every connection and clean them with 150 grit. They need to be clean and shiny enough the queen would eat off them Pull every one, one at a time. It will take the weekend

The wiring schematic is all the help you need If you do not understand the wiring schematic or how to proceed. Then open your wallet to pay someone who does

In one picture you have a switch panel with 2 broken Carling switches. In the other 3 pictures you have 2 Carling switches with a wiring harness and your broken switches Either your boat has that sub-harness or it doesn't Based on the pictures you do not have the sub-harness So pull the...

Gauges 5 amps Bilge pumps and livewells 15 amps Horn and nav lights 10 amps

My local trailer shop sells bunk carpet in 3 different widths

Go to the top of the forum. You will see the diy sticky. In there is a link listed as additional Mercruiser information. Scroll down a bit to the videos

Install a mechanical gauge and confirm oil pressure The alarm trigger point is either 4 or 7 psi depending on the switch. Since both the gauge is dropping and the alarm switch is triggering and both are wired separately. I would lean towards actually dropping oil pressure While the oil is...