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Made fresh new battery ground cables and have them grounded to the block.. still cranking slow. I took the batteries to O'Reilly to have it load tested. Both of them tested good. I then put each one in my truck fires as my truck up just fine. At this point the only thing I can think is maybe...

Thanks. I'll report back let the boat know how it went

I ended up buying two gauge wires. I'm going to replace the starter wires and tomorrow I'm going to get two brand new batteries. But yeah all of my cables appear to be 6 gauge wires. one coming from my battery switch, is marked as 6 gauge wires, the other ones that I don't see any markings...

Okay guys, I have some 4 gauge power wire from an old amp kit, can I use that to make cables for this just to test it to see if it helps. It is 4 gauge but it's that really fine copper not the hard stiff ones. Currently my battery setup is with 6 gauge wire I just don't want to put a ton of...

Okay now I feel dumb. I cut open the wire loom that runs along the stringers. The battery is grounded to the flywheel housing. Then another cable attaches to the battery which connects to the other batteru. That battery cable is the one that was melted and really bad shape. So I think what...

But yeah the starter grounds through the mounting bolts to the block right? So the batteries have to be grounded in some way, I wonder if it's one of those smaller wires on the grounding strap comes off of that into that wire loom along the stringers and then onto the battery Because now that I...

Yeah I think my next step is to remove the house battery completely out of the equation , then hook my f starting battery directly to the starter with a fresh positive cable and a fresh ground that's actually grounded to the engine. And see if my cranking returns to normal. If it doesn't that...

Yeah that's what I was thinking, but my ground wire attaches from my bank 1 battery goes around the engine goes to some kind of terminal coupler directly behind the engine (But just floating it's not attached to the engine, it was attached to the firewall behind it) , then that wire goes to a...

This is my 16th year with the boat And I've never messed with the wiring , So it's been like this ever since I've owned the boat, I just figured I should redo all my battery cables to try to eliminate that as the problem. And that's when I found they just connect to each other. Also when I crank...

Oh also the ground wire that loops behind the engine, it appears they are joined with some sort of battery terminal in the Middle with a bolt through it or something I can't really tell because the insulation melted to it. I think it's two eyelets ends of each cable being adjoined with a...

Hi guys Okay I've done a lot of research on the internet and iboat, and I'm stumped still. Hoping someone could steer me in the right direction with my individual problem. Took the boat out of storage from winter, everything fired up just fine, Strong crank and fired with minimal effort. went...

OK thanks for the explanation. I just thought maybe the button was stuck lol. I got it figured out. You guys are awesome thanks for your help

It did explain ! I didn't realize that those 2 Gray wires were part of the system, somebody told me those go to the tach and the lanyard safety switch and to just remove them and see if it will start. I put those wires back on and it fires up

OK thanks I'm going to read through this tonight. I put a new distributor cap, rotor and Ignition sensor in , still no spark. I noticed that 50 amp red button doesn't really click like a button like it's stuck. Should that click? If I connect the 2 terminals will that bypass it? Maybe that has...

I got it off thank you. The sensor contact was rusted and corroded, The inside of the button also had rust on it. I tried hitting everything with sandpaper Is to clean the surfaces, thinking I might at least figure out that that is the problem so I can order new parts. But it's still didn't...

Yeah I see the sensor, but the rotor seems to be stuck in place ,do they seize up? Do I just need to pry it out of there?

Wow... I wouldn't have thought that , that's why I asked , thanks. So how do I get the Ignition sensor out of the distributor?

So I'm using a test light with voltage. And when I put the test light on it , it does read 11.8 for a second but then it immediately drops down to 10.3 I guess because of the load of the test light. Is that OK? I'm just wondering if the sensor's not getting the proper voltage to it

Guys I am stumped and I'm not getting spark and Ignition systems are my weakness. Before I took the boat out on the lake for the 1st time this year I ran it on muffs and it ran great, So I headed to the gas station filled it up with gas and dumped it into the lake. It fired right up, but...

I have a 1997 5.7 350 MerCruiser, the carburetor is dumping gas and it floods immediately, even from startup on the trailer to the dock it floods. I I rebuilt the carburetor last year and it was better, but it got super bad this year so I just replace the entire carburetor assembly. Still the...