Wire Sizing....

[rollingrightalong]

I'm rewiring a 1981 Boston Whaler 'Outrage' V-20 and relocating the batteries to the cockpit. I've made the cockpit tippable (like a truck cab) to get access to the wiring and batteries when necessay.
The distance from the twin Mercury 1981 90HP O/B's is 15 feet for one engine and 20 feet for the other. I need the guage of wire to run between the batteries and O/B's that can take the starting amperage and charging.
I believe that the starter motor is also the charger and is always connected to the motor, but I'm not 100% sure.
I've just moved this post because it's really a wiring issue, not a mercury O/B issue.
Thanking you in advance....

 

[LippCJ7]

Re: Wire Sizing....

I am not an outboard guy so take that for what its worth, do you ever start both motors at the same time? If not I would run 4 gauge wire (positive and negative) from the battery or battery switch to a point near both motors and install a positive and negative buss then run your starter motors to the buss, this would save you from running more wire then you would need. 4 gauge wire could be overkill though since I have no idea how much you motors draw at startup I am going off my knowledge of I/O's so I hope it helps.