Starter interupt wiring question

[tictactug]

I am installing a blue seas add a battery system to my boat.

I'm trying to avoid electrical drop on start up so that my electronics don't drop off.

Blue seas has a starter interupt wire that needs to be connected either at the engine or where the key is turned.

Anyone have the location to where I could splice into the starter signal from the key. I'd rather not dismantle the control box, and I don't think it's any of the wires that hang down out of it. This leaves the engine itself. Do any of you know which wire carries the signal from the key to the starter?

Any help is much appreciated.

[rodbolt17]

its the brown wire in the 10 pin main.
depends on which control box/keyswitch assy your using to tell any more.
whats the full model number of your engine and why are you adding that system?

[tictactug]

I wil find the exact model number tonight. It's a 2009 four stroke 150. but beyond that I can't remember the model number or the number on the controls.

As far as the "why" Raymarine has a very sensitive black box for their fish finder. It hates any type of voltage drop. It will reset itself each time. I have added blea seas system because it is designed to disconnect the house batteries from the system as soon as the starter is keyed. This stops that voltage spike.

[rodbolt17]

means whoever rigged your boat screwed it up and you just blowed money.
that blue sea set up may or may not help.
however rigging it correctly by shifting some wire will.
do you realize the F150 charging system already has a battery isolator built in to charge a house battery seperatly from the starting battery at NO COST?
that blue sea system, in my experience, simply does not work.
but your engine came from japan with a battery isolator that can charge both the starting battery and a house battery while both are seperate.
in fact most all V6 motors since about 93 and all F motors above 150 and above have this wiring.

[tictactug]

703 is my shift console. Engine F150

I appreciate the feedback of the charging system.

Have you run a raymarine DSM300 before? Even with an isolated charging system a dip from the starter will cause it to reset.

I had this issue in the last boat and don't feel like reliving it.

What is done is done at this point. Good bad or otherwise everything is hooked up except the starter interupt.

[rodbolt17]

to access the brown wires in the 703 requires the control box to be dissasembled. but brown is the start wire in the ign harness.
to access the battery isolator wire under the hood requires removing the hood.
look carefuly about the frount where all the wires mount.
locate the large red wire with a water proof cap.
make a wire lead with a 50 amp fuse from that lead to the house battery positive.
now the house battery will charge from the engine and as long as you dont combine them with the battery switch its TOTALLY ISOLATED from the engine battery.
thats why its called an isolator.
most riggers and half the techs ont know why its there and even more dont know its there.
but thats what that big red capped off lead under the hood does.
it can charge two totally seperate batterys and one can drain without affecting the other.
same as your blue sea thing only it works.

[Tucker]

I'll be dog-gone. Wondering if this was used on my S200's, located on starboard side towards bottom of cowling. Been starring at the wire since I've had the boat, couldn't find a reference to it in the shop manual. Tech told me it was for accessories. Seems like a great idea, how come riggers don't use it?

[99yam40]

From what Rodbolt17 wrote, maybe they like you did not know what it is for.
When you guy said accessories maybe he was referring to the accessory(house) battery.
Not all boats are rigged with 2 batteries and if they are some find it convenient to be able to switch different batteries on and off or even tie them together sometimes

[rodbolt17]

almost all V6 motors from about 1990 and some fuel injcted 4 stroke 4cyl motors have a battery isolator built into the voltage regulator that can charge a battery seperatly from the engine battery without either battery knowing the other exists.
all ya gotta do is rig it.

[Tucker]

almost all V6 motors from about 1990 and some fuel injcted 4 stroke 4cyl motors have a battery isolator built into the voltage regulator that can charge a battery seperatly from the engine battery without either battery knowing the other exists.
all ya gotta do is rig it.

This sounds like a beautiful thing. Add a separate bat switch for the house battery and all the electronics can be isolated from the starting circut. Makes trouble shooting electical problems a little easier too.

This is my second Grady. Little pi$$ed neither was rigged that way. Makes too much sense and looks easier to rig in the first place. Betcha the install tech's weren't away of this.