2002 Mercury 115 ELPTO 2 Stroke electrical output

[Texasmark]

I would guess that your motor has pull start capability. If so, no harm no foul if the start battery goes dead.

Having said that, I see no problem in having two batteries. One for start and one for the house. With a VSR/ACR/Combiner/Isolator/Etc. between the two.

The alternator on your model does not produce enough current to harm anything.

When I bought my first new boat it only had one battery. I wanted and added a trolling motor. One day while fishing I drained the battery to the point where it wouldn't roll the 85 HP Chrysler triple. In the underside of the canopy/hood whatever, was a plastic pouch with a cranking rope.

I got it out, got the engine ready to run like when using electric starting, installed the rope and gave her one big yank.....engine fired right up. After that trip I had 2 batteries. Never saw that again in any of the engines I had after that.

 

[flyingscott]

I have the service manual. The 4 cylinder no matter the color is 16 amps.

 

[boscoe99]

When I bought my first new boat it only had one battery. I wanted and added a trolling motor. One day while fishing I drained the battery to the point where it wouldn't roll the 85 HP Chrysler triple. In the underside of the canopy/hood whatever, was a plastic pouch with a cranking rope.

I got it out, got the engine ready to run like when using electric starting, installed the rope and gave her one big yank.....engine fired right up.ed to have After that trip I had 2 batteries. Never saw that again in any of the engines I had after that.

My 1997 175 EFI Mercury came with a pull cord in the pouch. Battery only needed to have enough voltage to run the fuel pump. Like you, I tried it. Surprisingly easy. Motor started right up. Never needed to use the cord again.

 

[LakeMichiganBoater]

And there are so many lithium jump packs out there now too.

I guess my main concern was not the battery draining, but longevity of the alternator/stator if I continually put a large draw on it.