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Old 22 March 2014, 13:18   #1
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Wiring up my searider

Hi guys I have a few questions in regard to wiring up my boat.

Basically I have a forward 'd class style' console with a center console sitting behind it. The battery has a compartment in the front console.

I need to know the name of the item that can be used to connect several wires into one. What I mean is, if you have all your different wires for different things e.g. vhf, gps etc. Then can you connect all these wires into a component which then only has one pair of wires leading out I can connect to my battery (and also so I can install a main switch into this main wire.

Hope that's explained ok!

Cheers
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Old 22 March 2014, 13:54   #2
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Possibly "bus bar"?
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Old 22 March 2014, 14:17   #3
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Any DIY store or electrical outlet will sell "chocolate block" sometimes called "choc block" these come in 5A 10A 15 Amp and so on, my suggestion is get the size that will accommodate the amount of wires you want to bunch together . Personally 15 amp works for me. If its going to be exposed to seawater or the elements a encasement might be a good idea. Electrical plastic enclosures are available in the same places. Finally before putting the front cover on a squirt of WD 40 is beneficial. Inline fuses in both pos and neg should safeguard you . If you want a switch or isolator thats not going to cause any problems.Depends on what sort of standard you want to work to glands are available to seal the entry of the cables or there is good ole silicon. Regards Jim
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Old 22 March 2014, 14:25   #4
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Or you connect each wire up to a switch unit which has one pair of wires coming out to the main isolator.

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Old 22 March 2014, 14:30   #5
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Thanks for the responses!

For how I understand it:

You have all the positive wires from the appliances running into one fuse box, which then has one wire which leads to the battery. Then on the negative side you have all the wires from the appliances running to a bus bar, and again one wire from the bus bar running to the battery.

Am I right?

Also would you connect a big switch which can break the main positive wire heading back to the battery?

Henry
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Old 22 March 2014, 15:59   #6
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Yes to all of the above.
Need to think if you have any kit that should be permanently on
Need to think where the charge wire goes to from the engine (I'd put it battery side of the isolator switch but I could be wrong)
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Old 22 March 2014, 16:03   #7
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Originally Posted by ShinyShoe View Post
Yes to all of the above.
Need to think if you have any kit that should be permanently on
Need to think where the charge wire goes to from the engine (I'd put it battery side of the isolator switch but I could be wrong)
I will install a switch panel so i can turn on stuff individually (anything that needs to be on permanently can be left on using swtich).

The outboard will have its own terminals which can just connect straight onto the battery can't they? Or does that connection have to be broken by a switch also?
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Old 22 March 2014, 16:10   #8
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Henry, you are working with DC there is no neutral and positive it is positve 12v and neg 12v so bearing in mind I was used to working on steel ships so fusing the pos and neg was standard. So to simplify take a pos wire from the battery and a neg wire. These need to be bigger than the sum total of the wires you are going to add for your devices. Take these into a switch that will break both poles ie pos and neg( I think thats a wiser way) then you need to ideally go into a fuse block (available on evil bay) then from the other side feed your device you loop across the base to the next fuse to feed the next device and so on all negs can go into a connector block.
That should do you. Regards Jim. If my explanation is not clear enough pm me and I will sketch up something and email it.
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Old 22 March 2014, 16:17   #9
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I *think* putting a switch in the engine feed is bad. Certainly some car engines don't like it if the battery is suddenly switched off - it dumps a load of power back into the engine electrics and you could need to buy a new ECU! Bad design in my opinion!

So I'd say connect engine direct to battery.

Bet ya someone is along in 5 to say "NO thats a fire hazard" or somet
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Old 22 March 2014, 16:27   #10
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Totally agree with above , alternators do not like going from load to open circuit they tend to blow diodes! Regards Jim
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