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Old 08 August 2014, 15:31   #1
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connect wires

I need to replace my bilge pump which means connecting the 12 inch pump wires to the boat wires which are wrapped inside spiral wrap above the deck before all the engine wires go through a gator under the deck, so do i solder the wires then shrink tube before replacing the spiral wrap or do i just use shrink crimped connectors, and are the halfords ones ok or are there special marine crimp connectors?
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Old 08 August 2014, 17:24   #2
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solder it then shrink wrap crimps will corrode two different metals in contact will always corode where they touch even if you keep water out
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Old 08 August 2014, 18:34   #3
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Use glue lined heatshrink connectors. Soldring is a bad idea on something right next to the bilges.

Use decent quality ones-the ones from Vehicle Wiring Products for example are tinned copper, so you won't have corrosion issues.
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Old 09 August 2014, 16:54   #4
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Thanks i got those shrink crimp connectors today from force4 and new pump so will fix tomorrow with my new crimping pliers, might be doing in the rain though!
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Old 09 August 2014, 20:06   #5
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Quote:
Originally Posted by beerbelly View Post
solder it then shrink wrap crimps will corrode two different metals in contact will always corode where they touch even if you keep water out
Which 2 different metals? Crimps are copper, as is the conductor in wire.

In any case, you won't get dissimilar metal corrosion unless you have the joint submerged in saltwater (and if you do, your wire isn't going to last long anyway.)

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Old 11 August 2014, 09:00   #6
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Use glue lined heatshrink connectors. Soldring is a bad idea on something right next to the bilges.

Use decent quality ones-the ones from Vehicle Wiring Products for example are tinned copper, so you won't have corrosion issues.
Now being an electronics engineer i find this odd.....
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Old 11 August 2014, 09:09   #7
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We Always Solder then 2 layer of glue lined heatshrink been doing this for years 40 + and never had issues, It is a MoD approved way for numerous projects that I have worked on as an electronics engineer.
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Old 11 August 2014, 16:02   #8
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Now being an electronics engineer i find this odd.....
Glue lined heatshrink crimps give the joint mechanical stability plus seal the joint from the outside environment. As does Ashbypower's method below.

The reason I gave the OP the reply I did was because it's the easiest,quickest most secure way to do a pretty grotty job in an area that'll already be contaminated with salt and dirt.




Quote:
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We Always Solder then 2 layer of glue lined heatshrink been doing this for years 40 + and never had issues, It is a MoD approved way for numerous projects that I have worked on as an electronics engineer.
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Old 10 September 2014, 03:59   #9
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You shouldn't have any corrosion problems as long as you solder using "Electrical Rosin Core solder" and that if properly sodered, each solder-joint must shine to almost chrome looking. Then, bypass using Heat Shrink Tubing as you want to make each finished connection Air-Tight. The best way I have found to do that is in using a "Liquid electrical tape" in two-three coats. It will insolate and waterproof each connection. There will be no corrosion as NO AIR can get in to the soldered joints.
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Old 10 September 2014, 08:03   #10
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A crimp joint using the right tools will usually be better than a badly done solder joint. All-in-one adhesive heatshrink crimps plus another heatshrink tube if you want belt and braces. Re comment about corrosion, the adhesive should squeeze out the air.

There's a line of thinking that solder can wick up the wires in the cable. This can make it more prone to failure if there is insufficient support around the joint.
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