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Old 05-03-2017, 06:57 PM   #1
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Default Boat will not start

I own a 2300sc with a mercruiser 5.7 L thunderbolt 5 ignition engine. I hook up the muffs with my hose and turn the water on. I open my engine bay cover to allow fumes to exit and turn my blower on to rush the process. I then turn the key to the on position, all gauges come on but there is an alarm sounding not sure what it's for. Then I push my neutral button and push the throttle forward half way. After that, I go to start the engine and sometimes it clicks but sometimes the starter engages but it's not fast enough to start the engine.

I took battery out and charged fully then put it back in. I also tried with my battery charger hooked up.

I checked the wires for looseness and the "red button" to ensure the circuit breaker wasn't tripped. All is good.

I went behind the ignition switch and "hot wired" the two wires to make sure the ignition switch was good.

When a wire from the starter caught fire I put it out and quit immediately.

*I started my boat about 2 1/2 months ago with no issues at all. Cranked right up and ran for about 10-15 minutes.

Anyone possibly know what the problem is and where to get fixed? I live right by fort Bragg, nc.
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Old 05-03-2017, 07:51 PM   #2
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Why did you feel the need to hot wire it when the starter was engaging? Sounds like a bad solenoid but that would not cause the wire to catch fire ...
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Old 05-03-2017, 08:33 PM   #3
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The starter stopped engaging so I wanted to go through the list of possibilities that I knew of.

The solenoid is the bracket looking thing that has a bunch of connections on it on top of the engine by the carborator correct?

The fire may have been from me trying over and over again trying to start it... maybe the starter got too hot? I don't really know.
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Old 05-03-2017, 11:07 PM   #4
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First it sounds like a bad slave soleniod which is mounted next to the engine breaker.

Second what wire caught on fire? Battery wire or one of the smaller ones. What color? This will need repair or replacement but not enough info to help here.
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Old 05-04-2017, 02:36 AM   #5
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It's a black wire only about 3" long. Looks to have both ends connected to the starter itself. It's towards the front of the starter (White part is where it caught fire) wire still connected It was the wire cover that caught fire.

The starter solenoid... what exactly does that do? Where would be a good place to get one?
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Old 05-04-2017, 02:55 AM   #6
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Cannot make out where the wire is connected to. What terminals?

The slave soleniod is engaged when the ignition key is in the start position and then applies power to the starter. You can get it from a mercruiser dealer, online or westmarine store. About $25 US
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Old 05-04-2017, 12:20 PM   #7
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Looking at the picture on a PC instead of an iPad that is a ground that goes from the starter solenoid to the body of the starter.

BTY have you checked that the battery connections a clean and tight as well as the other ends of these cables?
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Old 05-04-2017, 01:47 PM   #8
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You bypassed the solenoid and wired the starter THROUGH the ignition? The purpose of a solenoid is to allow the solenoid to be the switch between the battery and a device with a significant amperage draw, like a starter. This requires positive and negative wires large enough to handle the amperage draw. The ignition switch is a low voltage switch that electrically closes the gate on the solenoid completing that circuit. It prevents the long run of large gauge wire and the delivery of amperage all the way from the batteries to the ignition on the dash, then back to the starter.

It sounds like you overloaded the ignition circuit. I would consider replacing the wires that you caught on fire.
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Old 05-04-2017, 01:51 PM   #9
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Incidentally, I would suggest a volt meter. I like to work from the device back to the batteries.

1) Verify there is amperage on the device (Starter)
2) Verify there is amperage at the solenoid.
3) Verify there is amperage at the battery.

Inspect any devices or connections between where you're getting a working reading and where you're getting no reading. sometimes this process requires two people.
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Old 05-04-2017, 05:14 PM   #10
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Quote:
Originally Posted by shrew View Post
Incidentally, I would suggest a volt meter. I like to work from the device back to the batteries.

1) Verify there is amperage on the device (Starter)
2) Verify there is amperage at the solenoid.
3) Verify there is amperage at the battery.

Inspect any devices or connections between where you're getting a working reading and where you're getting no reading. sometimes this process requires two people.

1-3 verify amperage or voltage? A standard voltmeter is not designed for these high currents.
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