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Mariner 115 turns over like battery is dead but its not it was running fine then this started happening what could cause this

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Try this YouTube link to get started:

Outboard Motor Won Start Try This

Also, a guy at this site has a similar problem:

Mercury 115HP 2 stroke won start FIXED Page 1 iboats Boating Forums 430218

The solution is to take a logical troubleshooting approach and not just throw parts at the issue hoping to get lucky. Here are some hints:
1) Measure the battery voltage. Then measure it again while trying to start the engine. If the voltage drops below 10 volts while trying to start the battery is discharged or bad. Charge it and then have it load tested at any auto store -- test is generally free.

2) If the battery checks ok, disconnect the large battery cables and clean the terminal ends and battery terminals thoroughly. That means both the battery end and the engine end. Reinstall the cables and tighten them securely. If you use wing nuts on the battery posts, replace them with stainless hex nuts and a start washer for better connections.

3) If the issue is not resolved at this point, Use jumper cables to jump directly to the starter. Black cable goes from battery NEG to engine block (unpainted bolt or bracket). Red cable goes from battery POS and touched to the large post on the starter solenoid that feeds the starter. If it still doesn't spin, you have a bad starter. If it does spin, then the solenoid is suspect.

The ignition switch, neutral start switch and the start switch wiring can also play into this but I doubt that's the issue. The solenoid can be verified by using a screwdriver to jump the small terminal to the large terminal to which the POS battery cable is connected. If doing that spins the engine, the solenoid is good and the wiring/switches are suspect.

Posted on Apr 13, 2015


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SOURCE: Randomly won't start, happened after jumping dead battery

Probably the battery. Take it the chain auto parts place and they will test it for you.

Posted on Aug 29, 2009

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