Re: 1988 Mariner 115 electrical issue?
Either the battery is completely shot, or one of the connections to it is bad.
The battery can be tested at NAPA, or Clown Auto, or even Wal-mart.
Yer charging system is good.
Note that your system does not have a voltage regulator. The voltage is limited by the battery. Routine battery maintenance will minimize the damage from overcharging, but the battery will use water, and if allowed to get too low on water it will self destruct. Don't even think about gel-cell or AGM batteries. Just put in a cheapo group 24 marine motor starting battery and plan on routine maintenance and replacement every 2 - 3 years.
hope it helps
John
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