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Please explain wiring diagram for me

Old 04-06-2003, 06:33 PM
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Default Please explain wiring diagram for me

I have twin outboards and two batteries. Currently there is one "On/Off" switch. In "Off" position, the starboard battery is always on (no good). In the "On" position, both batteries are selected.

I want to re-wire so either battery can start either engine. And both batteries are always being charged while the engines are running. This is the diagram that Perko has on their site. I know that according to this document, either battery can start either engine, but what about recharging the batteries? Does this diagram allow me to do what I want?



Thanks,
Scott K.
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Old 04-07-2003, 06:31 AM
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Default Please explain wiring diagram for me

Scott, normal operation would be as follows.

Port switch in position 1.
Stbd switch in position 2.


If you get into trouble and need to use the other battery to start a motor. Make sure the "Good" motor has it's switch in the off position while starting the other. Once started you can switch the "bad" motor to it's normal position, and then go ahead start the good motor in it's normal position.

At no time do you want both motors connected together and running.
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Old 04-07-2003, 06:38 AM
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Default Please explain wiring diagram for me

Special-K... It sounds like you have a plain On/Off switch that has been rigged as it was not intended. Sound right? If you rewiring I might suggest two switches as in photo below: You can do almost what you want to do with one swith as in your Diagram #1 but you'll still need a new switch. With two switches as above (Perko Diagram #2) I have a greater range of options. Off, Both motors on one battery (either battery #1 or #2), both motors on both batteries (All), Starboard motor on #1 and Port on #2 or visa versa. By the way NEVER shut of motors by the switch, use ignition key. Hope this gets you on the right track. I like to think...two motors, two batteries, and two switches; minimum. Some people go with three or four batteries. Oh, one last point, the motor is always charging the battery its connected to by the switch.

Boston Whaler, "MUMBLER", 24' Outrage (1996), twin 175 HP Evinrude Ocean Pros. Snowball, the cat...

[This message was edited by Mumblerone on 04-07-03 at 10:22 AM.]

[This message was edited by Mumblerone on 04-07-03 at 10:23 AM.]
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Old 04-07-2003, 07:34 AM
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Default Please explain wiring diagram for me

..the dealer rigged my boat; 2 motors, 2 batteries, 1 switch(1 All 2).. he's put pos(+) from each batter to common feed on switch then then wired pos(+) lead from each engine to #1 and #2 position on switch.. negative side of each battery goes to its respective engine.. dealer told me to run it in the "ALL" position and both batteries wud be charged.. here is one of my concerns: Mumblerone's plaque on his boat sez.."never run with switch in parallel.."
..well the hydraulic steering linkage between engines makes for a common ground and therefore when i do as deal sez arn't i running with engines in parallel and courting "..serious damage.." ?? ..help!! ..i'm confused!!
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Old 04-07-2003, 02:24 PM
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Default Please explain wiring diagram for me

bummer12, what you described is bad wiring, no way around it.

You need to contact the boat manufacturer and talk with them to find out what they recommend, and then present that to the dealer and have them fix it right.


By the way CG and NEMA code insists on having a ground wire to be run between the batteries. You dont want the mechanical equipment provinding your grounds.
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Old 04-07-2003, 02:58 PM
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Default Please explain wiring diagram for me

I am a bit concerned with my setup now. I have 2 outboards, 2 batteries, and 1 switch.

I have battery 1 going to position 1 input on the switch.

I have battery 2 going to position 2 input on the switch.

I have both engines hot lines coming off the hot output of the battery switch.

I posted about this a few weeks back, and most of the responses said my setup wasn't going to hurt anything, or cause any problems, but people did recommend a 2nd switch. Am I safe? I am worried now.
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Old 04-07-2003, 03:15 PM
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Default Please explain wiring diagram for me

I plan to re-wire as per diagram #2 from Perko.

You said at no time do you want both motors connected together and running. Does this mean neither switch should be in the "both" position?

You wrote:
If you get into trouble and need to use the other battery to start a motor. Make sure the "Good" motor has it's switch in the off position while starting the other. Once started you can switch the "bad" motor to it's normal position, and then go ahead start the good motor in it's normal position.

Couold you explain this again? Let's say the port side battery is dead, for instance. How should I start the two motors? Am I going to damage anything by changing the switch positions while the engines are running?

-Thanks in advance,
Scott K.
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Old 04-07-2003, 04:32 PM
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Default Please explain wiring diagram for me

Special-K... I'm not an expert but let's see if we can all learn. First of all if you get two new switches like I have and wire them per Diagram #2, your OK. Just so we're on the same page, I'll describe my setup. Generally I will start Starboard motor on #1 position, I'll in turn start port motor on #2 position and that's the way I use them all day. Both batteries get charged by respective motors. If I chose, I can put both swithces on #1 and start both motors off battery #1 or put both switches on #2 and start both motors off battery #2. I might want to do this if for example battery #1 is dead. If both batteries are a little weak I might want to switch to 'ALL', this puts both batteries in parallel and hopefully has enough juice to start motors. If I turn to 'OFF' both batteries are off and thats the way I leave it between trips. It tells you not to run in the 'ALL' position because now you have both motors on the same circuit, and I believe is related to charging...this is where I get foggy...NEED HELP HERE! This condition relates to your 'ON' position. Same condition as my 'ALL' when you think about it. I assume you have a Perko switch? I reviewed all the Perko switch combination (wiring diagrams) and nowhere does it show ONE switch and TWO motors. ONE switch and TWO batteries: YES. Let's see what others say...

Boston Whaler, "MUMBLER", 24' Outrage (1996), twin 175 HP Evinrude Ocean Pros. Snowball, the cat...
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Old 04-07-2003, 04:39 PM
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Default Please explain wiring diagram for me

Hey, you guys are getting wrapped around an axle for no good reason. Bummer & Bucktail, what you have is not ideal but it is OK. There is no harm to anything to have the engine leads coming together to the common lug on a 1-2-both switch. I won't have a 1-2-both switch on my boat but the way you are wired is pretty standard.

28' Maxcat w/twin Honda 225's
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Old 04-07-2003, 04:47 PM
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Default Please explain wiring diagram for me

Mumbler-

I plan to re-wire as per the Perko diagram, I know the way the boat is riged now is wrong.

I too would like to know if this is "the" way to do it. I've been e-mailed twice by people who did not want to post, but told me to use two '"on/off" swithces. Keeping the two systems seperate. In a crunch, use jumper cables to put batteries in parallel. I don't think this is the way to go, but...what do I know.

Also, with two batteries, do you have poser going to the bilge pumps from both batteries, or just one?

-Scott K.
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Old 04-07-2003, 05:02 PM
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Default Please explain wiring diagram for me

Mumbler, the reason they say to not run on "all" is that boaters will run down both batteries by having house & electronics running on "all" when the engines are off.

28' Maxcat w/twin Honda 225's
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Old 04-07-2003, 05:21 PM
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Default Please explain wiring diagram for me

Special-K...I have a line directly from the batteries to the bildge pumps (2 pumps, different batteries) with proper inline fuse near battery on each line. This way I know I'll have two dead batteries when the boat sinks. Take a look at this http://www.guestco.com/installation.html#battery We can further chase our tail. Chaps...are you quite sure of that? Makes sense. Just looked through all Guest diagrams...No one switch, two motors, there either. Thanks for the thoughts...keep'em coming.

Boston Whaler, "MUMBLER", 24' Outrage (1996), twin 175 HP Evinrude Ocean Pros. Snowball, the cat...
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Old 04-07-2003, 05:49 PM
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Default Please explain wiring diagram for me

This is how you would wire 2 engines, 2 batteries, 1 switch using a 1-2-both combo switch. Very simple operational rule: Start engines on #1, #2 or Both, Cruise (charge) on BOTH, drift or anchor on #2. I'm not endorsing this but for those that want one switch and a simple life it is easy and foolproof (if you follow the rule!)


28' Maxcat w/twin Honda 225's

[This message was edited by Chaps on 04-07-03 at 09:03 PM.]
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Old 04-07-2003, 06:34 PM
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Default Please explain wiring diagram for me

Chaps - that sounds great. Thanks!
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Old 04-07-2003, 06:47 PM
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Default Please explain wiring diagram for me

The risk you run is blowing the voltage regulator in one or both of the motors. This is why you don't connect them together while running.

They arent designed for this, and if you do pop one, you'll play hell getting it fixed under warranty.

One of the reasons for dual engines is for redundancy. If they are wired together on the positive wire, you have lost that redundancy. How do you run on a good engine after the other one has just fried all its wires? You cant when their wired together.

Invest in another switch. It may save your life someday.
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Old 04-07-2003, 06:54 PM
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Default Please explain wiring diagram for me

Scott,

You said at no time do you want both motors connected together and running. Does this mean neither switch should be in the "both" position?

----------------
Thats correct. (see my earlier post above for why)
----------------
If you get into trouble and need to use the other battery to start a motor. Make sure the "Good" motor has it's switch in the off position while starting the other. Once started you can switch the "bad" motor to it's normal position, and then go ahead start the good motor in it's normal position.

Couold you explain this again? Let's say the port side battery is dead, for instance. How should I start the two motors? Am I going to damage anything by changing the switch positions while the engines are running?

-----------------
Put the stbd switch at "off", the port to "2".
Start the port engine and when running nicely, set the port switch to "1". Then set the stbd switch to "2" start the stbd engine, and off you go.

As long as you dont turn the switches to off, or to where both motors are connected together, you can use the switch while running.
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Old 04-07-2003, 07:27 PM
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Default Please explain wiring diagram for me

Thanks Sea_Dad.

-Scott K.
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Old 04-07-2003, 07:32 PM
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Default Please explain wiring diagram for me

whatever

28' Maxcat w/twin Honda 225's
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Old 04-08-2003, 05:10 AM
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Default Please explain wiring diagram for me

Chaps...I looked throught both the Guest and Perko webside trying to find a diagram with the setup you show. Where did you find that setup? I'm not being critical...just scratching my head. Thanks

Boston Whaler, "MUMBLER", 24' Outrage (1996), twin 175 HP Evinrude Ocean Pros. Snowball, the cat...
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Old 04-08-2003, 06:39 AM
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quote: Chaps...I looked throught both the Guest and Perko webside trying to find a diagram with the setup you show. Where did you find that setup? I'm not being critical...just scratching my head. Thanks


I think he saw it during a self induced hypnosis.
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