Accessory Assessment

Hey guys,

The guys at Manitou gave me your contact info last year for a boat wiring question. You solution worked out perfectly. Now I have another question that I'm hoping you can answer for me.

2005 Manitou pontoon boat

On my 2006 Manitou Aurora, I have a switch that is wired up and it says Acc on it.

My question is...

Is this switch basically just a spare switch that I can use or does it do something with the panel that I'm not aware of? I would like to wire up my depth sounder to it but I want to make sure I don't screw anything up first.

Any advice would be greatly appreciated.

Thank You.


The options that the switch could control would be very obvious: livewell pump, courtesy lights, etc. It probably does nothing and is just a blank.

The easiest way to answer this question is to look at the back of the switch. There should be 3 terminals on it.

  • Top right - ground for light inside of switch
  • Middle left - power into switch
  • Lower left - power to item
If the lower left terminal is open or has a short wire that leads to an open connector, then you should be all set to connect your depth sounder here.

Hope this helps,


Finding Fuses


Thank you for all of the great pontoon boat wiring info that you publish. It makes for great reading and a lot better understanding of how to keep these wonderful boats running.

My question is probably too simple for you to answer, but I could really use your help...

Tahoe Pontoon Boat

Where is the fuse box on a 2003 23 foot Tahoe pontoon boat? I have searched and searched, but can't find the thing!

Thanks again.


Thank you for the kind words. It's really gratifying to hear that I am able to help.

As for your question. On most pontoons, the fuse panel is inside the helm station.

Good luck,


Dead Outlet


Pontoon boat wiring is definitely not my strong suit. Could you please help me sort this one out?

Marine electrical 12 volt outlet

I was using the 12 volt outlet in my pontoon boat to power a Dc to AC power inverter.

I turned it on, then plugged in a small string of LED strip lights, and it worked fine. Then tried a larger set, my inverter beeped and then the lights went out. With a different power supply, the lights still work, but the 12 volt accessory outlet is dead.

What can I do to make the 12 volt outlet work again? What went wrong?

Thank you for your time,


Hi Harold,

It sounds like you blew the fuse for the 12 volt receptacle. Check the fuse panel and you will find the problem


Grounding the Gauges

Hi Kevin.

I recently bought all new gauges for my 1985 Evinrude 140VRO, including a tach, GPS speedo, fuel and water temp.

My problem is that I am struggling with the term GROUND! I have a fiberglass boat, so is Ground the same as Negative?

Can you please advise.

Many thanks


You are correct.

On your boat, Ground is the same as the negative of the battery.

Hope this helps,


Hello Kevin

That does help.

Could you please answer another question?

I'm hooking up a second battery, deep cycle. Can I have a common buzz for negative ground for both battery's? Do all the new gauges need to be fed from the cranking battery? Or does it not matter?

Thanks for your help.

 Best regards!


Yes. Use a common ground when adding a second battery.

No. Not everything needs to be fed from the cranking battery.

Keep in mind that without some method of connecting the positives of the batteries (switch, charger, smart switch, etc), the second battery will not be charged by the engine alternator.


Has Power. Won’t Start.


I have a 2004 Premier pontoon boat that will not start.

Premier Pontoon Boat

I have battery power as the motor will raise and lower, the radio will come on, etc.; however, the engine will not crank.

It worked well prior to putting it away for the winter.

What can I trouble shoot? Is there a fuse? How can I tell if the ignition switch is bad? Is there a neutral switch that can go bad? When I turn the key, nothing happens. BTW, I have a 50 horse Four Stroke Mercury.

Thanks in advance for any advice.


First check the in-line fuse on the engine near the starter solenoid (follow the battery cable into the engine from the battery to the starter solenoid). If the fuse is good, check for power at the key on the red or red/green wire.

This will solve your problem,