220 Sundeck GPS installation

• Aug 12, 2018

• #1

Pernalski

Member

Aug 12, 2018

42

Great South Bay, Long Island

Boat Info

2003 Sundeck 220

Engines

Mercruiser 5.0 MPI w/ Alpha 1 Gen 2

Hello All
We recently bought our first boat and being handy, I’m hoping to save a little money by installing a Chartplotter/GPS unit myself. The mounting is a no brainer, but I don’t have a clue where to connect the electrical. I’m assuming there are terminal blocks somewhere for all the cockpit electrical close by and I’m hoping there will be an open terminal available for the GPS power. I looked in the closet where the fuse box and radio sit and didn’t see the blocks in there and it doesn’t seem logical that I would have to run the wiring all the way back to the batteries. Any help would be greatly appreciated.
- Matt

 

• Aug 13, 2018

• #2

M

Maky

Member

Jul 13, 2017

44

Lake St. Clair

Boat Info

2008 240 Sundancer

Engines

Single 5.0

Isn't there a hatch below the wheel with the 12V block?

 

• Aug 13, 2018

• #3

Pernalski

Member

Aug 12, 2018

42

Great South Bay, Long Island

Boat Info

2003 Sundeck 220

Engines

Mercruiser 5.0 MPI w/ Alpha 1 Gen 2

Maky said:

Isn't there a hatch below the wheel with the 12V block?

Click to expand...

It’s very possible—we bought this boat on consignment and the salesman did not go over anything on the boat with us. I’ve been searching online, user manuals, and wiring schematics, but haven’t seen a location. I will look this weekend. Thank you for the response!

 

• Aug 13, 2018

• #4

Pernalski

Member

Aug 12, 2018

42

Great South Bay, Long Island

Boat Info

2003 Sundeck 220

Engines

Mercruiser 5.0 MPI w/ Alpha 1 Gen 2

I had a chance to go by the boat this evening—no obvious compartment near the steering. I attached pics to the post of the steering area as well as the compartment behind the steering where the fuse block and stereo are. Still looking for any help.

 

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• Aug 14, 2018

• #5

BillK2632

Well-Known Member

Jun 25, 2009

2,916

Lake Norman, NC

Boat Info

2014 Cobalt R5

Engines

Volvo Penta V8-300 DPS

You've got two accessory circuits on the fuse block - use one of those. You have the + connection right there behind the fuse and the ground bus should be behind the fuse panel somewhere. My boat had basically the same thing, I used the accessory circuit when I added cockpit lighting.

 

• Aug 15, 2018

• #6

Pernalski

Member

Aug 12, 2018

42

Great South Bay, Long Island

Boat Info

2003 Sundeck 220

Engines

Mercruiser 5.0 MPI w/ Alpha 1 Gen 2

Thanks Bill. I will look at the back of the fuse box next chance I get!

 

• Aug 17, 2018

• #7

L

Leardriver

Active Member

May 24, 2016

308

Denver, CO

Boat Info

2004 270 Sundeck 8.1 Bravo III

Engines

5.0, 5.7, 6.2 8.1 Bravo III over the years

I would unscrew the radio and tap into the positive and ground.

 

• Aug 20, 2018

• #8

Pernalski

Member

Aug 12, 2018

42

Great South Bay, Long Island

Boat Info

2003 Sundeck 220

Engines

Mercruiser 5.0 MPI w/ Alpha 1 Gen 2

The fuse box is enclosed in plastic, no terminals on the back—just a large harnessing the left hand side. I ended up cutting in to the radio harness before the plastic connection and before the radio fuse on the power connection. So far so good. Thanks again for all the help.