1983 115 Mariner charging problems

[Aphelion05]

I have a 1983 Mariner 115 I6 cyl. I bought 2 new batteries for it one is a deep cycle trolling , the other is a regular car battery I use for cranking. The problem I have is that the cranking battery is not being charged while the engine is on, so my battery just drains everytime I use it. From the other questions I have read it could be the stator, or maybe even the rectifier, the problem is that I don't know what/where the rectifier is.<br /> Also, while I was running it the engine seemed to sputter and jerk. I think it is because the only power it was getting was from the battery. Any help/advice is highly appreciated.<br /><br />thanks ahead

 

[The Marine Doctor]

Re: 1983 115 Mariner charging problems

To find the rectifier..follow the yellow wires from the Stator.<br /><br />Do you have the battery's hooked to an isolator for charging? Or is the starting battery the only one hooked to the engine?<br /><br />TMD

 

[ronmold]

Re: 1983 115 Mariner charging problems

Merc ignitions get their power from the stator red & blue wires. The key just opens the black/yel wire to run and shorts the black/yel wire to ground to shut off. Get a testmeter and ckeck the crank battery voltage when running above idle. If it doesn't go above 12.5 you have a problem with one or more of these: 1. stator 2. Rectifier 3. loose / corroded connections.