Ignition Switch Identification

[Jeff72034]

I've been trying to diagnose an ignition problem where my boat will try to start while it is already running. Even if I turn off the engine and leave the key in the "run" position it will eventually/sporadically start up on it's own. I'm thinking this is probably the ignition switch itself so I'd like to try replacing it to see if that helps. Could someone identify the ignition switch based on these photos? It is a turn key ignition (without push choke) that goes to a 2007 Mercruiser 5.0 220hp 305.

Also, bonus question, what is the small button located aft of the engine compartment blower switch?

 

[mjf55]

For the ignition switch, can the switch it self come out of the housing ( part with the square on the bottom )? If so, it looks to be a standard Mercruiser 5 wire ignition switch. Something like this part number - 87-17009A 5 - Switch Assembly. If not, it may be a custom switch unique to your 2007 Princecraft Vacanza 220.

As far as the button aft of the blower switch, no idea. I looked at the owners manual for your boat and did not see it. You will have to trace the wires and report back on what you find.

 

[Fun Times]

While your key switch looks like a three position, do you know if it is a 3 or 4 position key switch? There are two key switch models with different cut out hole sizes. 3/4 and 7/8 inch. While unlikely but just to be sure, is the engine digital throttle shift?

Yours looks to be the following... Mercury/Mercruiser New OEM Ignition Key Switch & Harness arnuber 87-897716K01 http://www.ebay.com/sch/i.html?_fro...on+Key+Switch+&+Harness+87-897716K01&_sacat=0

87-897716K01 is a three position key switch with shorter key and mounting length. (Off, Run, Start) Loose switch only. 3/4" cut out. Includes switch with decal and washer. Can be used on DTS as well as Non DTS installations.

If it was to be a four position switch with DTS, had a 7/8 inch hole cutout and a longer key switch then part number 87-893353A02 would of been needed, http://www.ebay.com/itm/141646675591

Be sure to mount the switch with the drain hole in the down position.

The 827 number on the side is for matching the key number so should you have lost your key you could order just a new key using the 827 (87-897716827) vs buying a new switch...

Can't make out the switch symbol... Does it look like this below? If not, then here' a good selection of switches to sort through, http://greatlakesskipper.com/catalogsearch/result/?q=Switches&cat=

 

[Jeff72034]

For the ignition switch, can the switch it self come out of the housing ( part with the square on the bottom )? If so, it looks to be a standard Mercruiser 5 wire ignition switch. Something like this part number - 87-17009A 5 - Switch Assembly. If not, it may be a custom switch unique to your 2007 Princecraft Vacanza 220.

As far as the button aft of the blower switch, no idea. I looked at the owners manual for your boat and did not see it. You will have to trace the wires and report back on what you find.

Thank you! It does come out of the housing, along with a harness and connector. I was beginning to think that the ignition switch is kind of a generic, non-specific, part that could be replaced so long as it was a 3 position, 5 wire, switch.

 

[Jeff72034]

While your key switch looks like a three position, do you know if it is a 3 or 4 position key switch? There are two key switch models with different cut out hole sizes. 3/4 and 7/8 inch. While unlikely but just to be sure, is the engine digital throttle shift?

Yours looks to be the following... Mercury/Mercruiser New OEM Ignition Key Switch & Harness arnuber 87-897716K01 http://www.ebay.com/sch/i.html?_fro...on+Key+Switch+&+Harness+87-897716K01&_sacat=0

87-897716K01 is a three position key switch with shorter key and mounting length. (Off, Run, Start) Loose switch only. 3/4" cut out. Includes switch with decal and washer. Can be used on DTS as well as Non DTS installations.

If it was to be a four position switch with DTS, had a 7/8 inch hole cutout and a longer key switch then part number 87-893353A02 would of been needed, http://www.ebay.com/itm/141646675591

Be sure to mount the switch with the drain hole in the down position.

The 827 number on the side is for matching the key number so should you have lost your key you could order just a new key using the 827 (87-897716827) vs buying a new switch...

Can't make out the switch symbol... Does it look like this below? If not, then here' a good selection of switches to sort through, http://greatlakesskipper.com/catalogsearch/result/?q=Switches&cat=

Thank you! I'm pretty sure everything on the boat is analog and not digital. It is a 3 position switch. I'm confident that the link you sent me is the correct switch. Also, I didn't know about the drain hole. That is very helpful information because I have every indication that the starter issue was somehow a short or crossed wires or something of that nature. I'm wondering now if what is needed is merely to dry out the switch and adjust the ignition so the hole is facing downward. Very helpful. Thank you again!!!