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Old 22 April 2006, 03:01   #1
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electrics questions -several

Hi

What is good practice in respect of connecting up electrical/electronic accessories?

Marine grade fully coated wire - what about connectors/crimps? web supplier recommendation?

Presumably (unlike a car with earthing all around) a sepearte -ve feed needs to go to each unit? from a ground bus bar?

If I want to add a SeeMe active radar - I would rather keep the unit (and its wiring) at the A frame only. can I get a reliable -ve and + from the Suzuki DF115? thus avaoiding running additional wires from the battery/console right the way back.

Require reliable main battery cut off switch (none currently fitted)- any makes/models recommended. nb have used racing car types in the past and not been pleased with longivity.

any comments welcome on any of the above.

Thanks
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Old 22 April 2006, 04:47   #2
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Tinned stranded copper is best (more corrosion resistant than straight copper.)

I always thought the best splices were soldered and adhesive-lined shrink sealed, but the ABYC (American Boat and Yacht Council) now says that soldering is a no-no, as it creates a definite flex point where the solder ends, making failures more likely. They suggest crimps (I suggest using adhesive lined shrink crimps), though, personally, I see little difference in the flex of the wire at the exit.

For general wiring tips, try to eliminate spots where water can wick its way up the wires; you can use silicone grease to seal things up if the wiring is somewhere that is out of the way - messy if it isn't out of the way. Grease also makes a good corrosion barrier on exposed terminals.

If you can't find adhesive lined shrink tubing, a hot glue stick can be shaved, and the shavings stuck in prior to shrinking regular heat shrink. Seems to work OK for me.

You should ideally run pos and neg wires, but from a couple of bus bars or a distribution panel (which you can get complete with switches and breakers or fuses); will make things a lot simpler to wire.

I would personally run wires back for your radar thingie. Have it fused, as well. If you wired it to the engine, it would not be powered while sitting on the hook with the engine off. On a switch from the battery, you have a choice.

jky
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Old 22 April 2006, 06:31   #3
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Quote:
Originally Posted by Paul Beaurain
..If I want to add a SeeMe active radar - I would rather keep the unit (and its wiring) at the A frame only. can I get a reliable -ve and + from the Suzuki DF115? thus avaoiding running additional wires from the battery/console right the way back.
You can do that but the Sea-Me has a wee brain with an LED indicator which shows when you are being pinged by radar. Could be slightly useful in the fog if you've not got radar and it lets you know that the Sea-Me is working. There's no indication of which direction you are being seen from, though. The wee control box containing the brain and on/off switch is not waterproof.
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Old 23 April 2006, 06:33   #4
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Wurth and RS componants are a good source for adhesive lined crimp connectors.
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Old 24 April 2006, 08:49   #5
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Farnell in one online

Farnell do both the heatshrink lined with hotmelt and heatshrinkable crimp connectors
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