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Author Topic:   Blue Seas Automatic Combiner Relay
alfred posted 09-06-2008 09:19 AM ET (US)   Profile for alfred   Send Email to alfred  
I am about to install the Blue Seas [Automatic Combiner Relay] unit. The instructions say to activate the Starting Isolation (SI) Option I have to run a wire between the unit to the cranking wire in the ignition. I have identified the wire as the yellow and red wire coming out of the ignition switch. Can anyone confirm this for me?

I also want to confirm, do I cut and extend the yellow-red wire to a terminal block and tap off this block for both the cranking wire and the SI terminal? Is there a better way? Is there another tap off point for the cranking wire?

I hope this makes sense!

alfred posted 09-06-2008 12:00 PM ET (US)     Profile for alfred  Send Email to alfred     
Fused terminal block?
jimh posted 09-08-2008 12:27 AM ET (US)     Profile for jimh  Send Email to jimh     
From the Blue Seas ACR with starting isolation, extend the conductor for the starting isolation circuit to the ignition switch at the helm. Connect it to the terminal on the ignition switch that is the START circuit. To help identify the ignition switch wiring refer to

You just connect the Blue Seas SI wire in parallel with the engine's wire at the ignition switch.

An alternative which might be more useful if the batteries are in the transom area near the engine would be to pick up the starting circuit under the cowling of the engine at the solenoid coil terminal. That will keep things shorter if the batteries are right near the engine.

alfred posted 09-09-2008 08:37 AM ET (US)     Profile for alfred  Send Email to alfred     
This is one of the times I wish I had an old style switch. The one I have is epoxy sealed! Have to trace the wire when I get back to see if there is a terminal it joins to in the console. If not it means a cut and splice and I am hoping to avoid that.
Chuck Tribolet posted 09-09-2008 07:06 PM ET (US)     Profile for Chuck Tribolet  Send Email to Chuck Tribolet     
What motor?

Splicing isn't that bad. The ignition switch is going to have
plug in the first foot or two. Unplug it, and see if you
can fish the boat wiring out where you can work on it.


alfred posted 09-10-2008 02:33 AM ET (US)     Profile for alfred  Send Email to alfred     
It's a VERADO 150 Verado on a a 190 [unrecognized acronym].
jimh posted 09-10-2008 09:02 AM ET (US)     Profile for jimh  Send Email to jimh     
If the ignition switch is encapsulated and connectorized, you won't find a convenient terminal to piggy-back your connection from the ACR SI circuit, and you'll have to make a splice. However, you should be able to pick up that circuit under the engine cowling right at the solenoid terminal, unless that too has been encapsulated and connectorized.
alfred posted 09-18-2008 11:34 PM ET (US)     Profile for alfred  Send Email to alfred     
Ok Going to get the bits to install the Blue Seas unit and have a question.

The Verado charges at 70 or 72 Amps. The instructions say to install a fuse between the unit and the battery. What size fuse should I use?

I checked here on the forum and saw a diagram for an install done by one of the members and the outboards charge rate was 20 amps and he used a 80 amp fuse.

jimh posted 09-19-2008 09:19 AM ET (US)     Profile for jimh  Send Email to jimh     
Alfred--If I understand your question correctly, you are asking about the current rating of a fuse which is to be installed in the circuit of the ACR. I believe this fuse is in the circuit of the ACR which connects the batteries in parallel. The rating of this fuse has to be sufficiently high to allow the usual current expected to flow when the batteries are in parallel. The current that will flow in that circumstance is determined by the relative voltage difference between the batteries, and by the distribution of charging current from the engine. The rating of the fuse ought to be larger than the maximum charging current expected. The purpose of the fuse is to protect the ACR in the event that one battery is suddenly at a much lower voltage than the other, a situation which could cause a very high current flow.
alfred posted 09-19-2008 11:30 AM ET (US)     Profile for alfred  Send Email to alfred     
Jim - What is the best way to calculate and estimate the suitable size?

I don't know If I did the right ting, but I ordered 2 x 100amp circuit breakers.

The batteries are 2 x Oddessy PC1500s. Charge rate of the Verado is 72 amps. I don't know the starting amp draw.

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