Starboard engine won’t start on battery 1

[Twomblytra]

Hi all,

I have a 2000 3300 SCR. My starboard engine won’t start on Battery 1. I don’t get anything - no oil pressure alarm or anything.

Port side engine starts on Battery 1. All electronics including the blower motor seem to be running on Battery 1. I tested the battery and it’s good for charge and cranking power. Starboard engine starts right up on Battery 2 and Both.

Am I missing a fuse or breaker somewhere that controls this? Any other ideas?

Thanks for your help.

[donald]

Try battery 2
Don

[mmwjr]

Is this a new problem? There should be two battery switches one for port and one for starboard. Are you saying the starboard engine will not start when it’s switch is in position one? Does it start in position two? How many batteries do you have?

[sph801]

It seems everyone's boat is wired different or there are different setups depending on options but my 2000 3300 has 2 batteries. Battery 1 starts the port engine and battery 2 the starboard. Other electronics seem to be split between the 2. I keep the battery isolator switches on 1 for port and 2 for starboard at all times. I've never needed to put the switches on "both". This is for emergency starts only when the battery that starts one of the motors is dead or weak.


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[Trey5684]

FYI for what it's worth on my 3100se I put both battery switches in position one and my boat seems to like that. It does seem like many boats of the same model are wired differently. Not sure if it happens at factory or dealer level.

[Twomblytra]

I have 2 switches - one for the port engine; the other for the starboard engine. The port engine will start on Battery 1, Battery 2 and Both. The starboard engine will only start on Battery 2 or Both.
I have until this month always used Battery 1 to start and operate both engines and then switch to Battery 2 when we’re on the hook.
I see the wiring diagrams, but still don’t understand how this can happen. I did check both of the 40 amp fuses behind the switch panel.

Thanks for everyone’s responses.

[Twomblytra]

Turns out the issue is not related to the battery switches but the throttles. Starboard throttle doesn’t consistently get into neutral to allow me start motor. But the battery investigation did surface that I need to replace the 50 amp accessory breaker on the battery switch panel. The only way to reset it is to hold it from the back (taking off the panel). Thanks for the help.