Proper way to tap into 12VDC wire? - SailNet Community

   Search Sailnet:

 forums  store  


Quick Menu
Forums           
Articles          
Galleries        
Boat Reviews  
Classifieds     
Search SailNet 
Boat Search (new)

Shop the
SailNet Store
Anchor Locker
Boatbuilding & Repair
Charts
Clothing
Electrical
Electronics
Engine
Hatches and Portlights
Interior And Galley
Maintenance
Marine Electronics
Navigation
Other Items
Plumbing and Pumps
Rigging
Safety
Sailing Hardware
Trailer & Watersports
Clearance Items

Advertise Here






Go Back   SailNet Community > On Board > Gear & Maintenance > Electrical Systems
 Not a Member? 


Like Tree15Likes
Reply
 
LinkBack Thread Tools
  #1  
Old 04-26-2012
CarbonSink62's Avatar
Load Bearing Member
 
Join Date: Sep 2011
Location: Derry, NH
Posts: 514
Thanks: 7
Thanked 7 Times in 7 Posts
Rep Power: 3
CarbonSink62 is on a distinguished road
Proper way to tap into 12VDC wire?

I haven't seen this answered elsewhere.

What is the proper way to tap into a 12VDC wire on my boat?

My C-25 has one lead for cabin lights that goes to all of them; I'd like to tap into it and wire up 2 more. I can't see a way to do it that isn't an invitation to moisture and corrosion.

The automotive style with the forked blade that cuts into the insulation of both wires is not appropriate. Having a terminal block just for lights and running a separate lead for each light seems like over kill.

That leaves cutting the leads (+ and gnd) and using crimp connectors to make a 'T', but the connectors will not shrink and seal properly because one end will have 2 wires coming out.

Is there an approved way?

What if I twist 'em together really good and wrap that with tape?
__________________
Zen Again

1978 Bristol 29.9 #122

Testing a mother's love since 1962
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote Share with Facebook
  #2  
Old 04-26-2012
Squidd's Avatar
Superior Sailor
 
Join Date: Sep 2011
Location: Eagle River Wi.
Posts: 904
Thanks: 3
Thanked 3 Times in 2 Posts
Rep Power: 3
Squidd is on a distinguished road
Re: Proper way to tap into 12VDC wire?

Quote:
The automotive style with the forked blade that cuts into the insulation of both wires is not appropriate.
Why wouldn't the silicone filled version designed for outdoor and undercarriage work be acceptable...?
Attached Thumbnails
Proper way to tap into 12VDC wire?-images.jpg  
__________________
"Might as well cast off...If anything is gonna happen...It's gonna happen out there..."
"Captin Ron"

Last edited by Squidd; 04-26-2012 at 11:57 AM.
Reply With Quote Share with Facebook
  #3  
Old 04-26-2012
PorFin's Avatar
Señor Member
 
Join Date: Sep 2007
Posts: 1,340
Thanks: 1
Thanked 8 Times in 8 Posts
Rep Power: 7
PorFin is on a distinguished road
Re: Proper way to tap into 12VDC wire?

I'd recommend a terminal block. A little more work, but a much better solution than the alternatives.
Sea Dawg likes this.
Reply With Quote Share with Facebook
  #4  
Old 04-26-2012
Stu Jackson's Avatar
Senior Member
 
Join Date: Jul 2001
Posts: 788
Thanks: 0
Thanked 9 Times in 8 Posts
Rep Power: 14
Stu Jackson is on a distinguished road
Re: Proper way to tap into 12VDC wire?

They make Y connectors.
jjablonowski likes this.
__________________
Stu Jackson, C34, 1986, M25 engine, Rocna 10 (22#)
Reply With Quote Share with Facebook
  #5  
Old 04-26-2012
asdf38's Avatar
Senior Member
 
Join Date: Jul 2010
Posts: 682
Thanks: 1
Thanked 4 Times in 4 Posts
Rep Power: 5
asdf38 is on a distinguished road
Proper way to tap into 12VDC wire?

Consider using a step down crimp butt splice. Anchor sells them. For example 14awg to 16awg and put the two wires in the 14. As suggested you could put something in the two wire side to seal it. I've used hot glue for that and think it worked pretty well (and it dries quick). Just consider any drip paths (put in drip loops as necessary) and it should be fine.
SVAuspicious likes this.
__________________
1979 Contessa 26
Boston, Ma
Reply With Quote Share with Facebook
  #6  
Old 04-26-2012
travlineasy's Avatar
Morgan 33 O.I. Perryville
 
Join Date: Dec 2010
Location: Maryland
Posts: 2,266
Thanks: 3
Thanked 55 Times in 45 Posts
Rep Power: 4
travlineasy will become famous soon enough
Re: Proper way to tap into 12VDC wire?

I never liked crimp connections, but in a freshwater environment you can get away with them. In a saltwater environment they're nothing but grief.

If you have relatively good access to the area, strip about 1-inch of the insulation from the main wire. Strip about 1.5 inches of insulation from the other wire.

Next, carefully wrap the second wire around the bared area of the first, then solder the joint. After it cools, apply a couple coats of clear, silicone cement to the connection, making sure to overlap onto the insulation by at least 1/4-inch at each end. The connection will never corrode and the connection is as secure as it can possibly be.

Good Luck,

Gary
tomperanteau likes this.
Reply With Quote Share with Facebook
  #7  
Old 04-26-2012
asdf38's Avatar
Senior Member
 
Join Date: Jul 2010
Posts: 682
Thanks: 1
Thanked 4 Times in 4 Posts
Rep Power: 5
asdf38 is on a distinguished road
Re: Proper way to tap into 12VDC wire?

Quote:
Originally Posted by travlineasy View Post
I never liked crimp connections, but in a freshwater environment you can get away with them. In a saltwater environment they're nothing but grief.
Uh oh.
__________________
1979 Contessa 26
Boston, Ma
Reply With Quote Share with Facebook
  #8  
Old 04-26-2012
Senior Member
 
Join Date: Sep 2007
Posts: 451
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 7
RXBOT is on a distinguished road
Re: Proper way to tap into 12VDC wire?

Obviously Gary never read the crimp vs solder thread or saw Maines 100#s of anchors suspended by a crimp terminal.
Reply With Quote Share with Facebook
  #9  
Old 04-26-2012
travlineasy's Avatar
Morgan 33 O.I. Perryville
 
Join Date: Dec 2010
Location: Maryland
Posts: 2,266
Thanks: 3
Thanked 55 Times in 45 Posts
Rep Power: 4
travlineasy will become famous soon enough
Re: Proper way to tap into 12VDC wire?

Quote:
Originally Posted by RXBOT View Post
Obviously Gary never read the crimp vs solder thread or saw Maines 100#s of anchors suspended by a crimp terminal.
Actually, I have. However, because I'm old and in-firmed, I tend not to believe everything I read and rely primarily on my own experiences. Having tried every connection method available for the past half-century, IME, soldering and sealing has never resulted in a single failure, and that's with 19 boats, all of which were used extensively in a saltwater environment. I have yet to have a crimp-connection, even the best, most modern sealed connectors, that did not eventually leak and wick up the wire, thus resulting in either reduced voltage, or eventual connection failure.

Different strokes...

Cheers,

Gary
Reply With Quote Share with Facebook
  #10  
Old 04-26-2012
Maine Sail's Avatar
Senior Member
 
Join Date: Jan 2003
Location: Maine Coast
Posts: 5,286
Thanks: 10
Thanked 117 Times in 85 Posts
Rep Power: 15
Maine Sail is just really nice Maine Sail is just really nice Maine Sail is just really nice Maine Sail is just really nice
Re: Proper way to tap into 12VDC wire?

Quote:
Originally Posted by RXBOT View Post
Obviously Gary never read the crimp vs solder thread or saw Maines 100#s of anchors suspended by a crimp terminal.
Or saw this...


The $6.00 crimp tool most people use:


A real crimp tool:




The method I use for what the OP wants to do is to use a terminal strip. If you absolutely can't fit a t-strip then a step down butt connector will work in a pinch.. I really don't like the three way connectors and the insulation slicing press on connectors do not last and often cause localized corrosion. I re-did an entire boat done with those at every light fixture last fall. Of about 12 3M press locks 2 were actually passing current....
__________________
______
-Maine Sail / CS-36T


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.




© Images In Posts Property of Compass Marine Inc.


Reply With Quote Share with Facebook
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

 
Posting Rules
You may post new threads
You may post replies
You may post attachments
You may edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On


Similar Threads
Thread Thread Starter Forum Replies Last Post
windlass 12vdc pc37howard Pacific Seacraft 3 05-05-2011 07:29 AM
Help w/ proper name ... wind_magic Gear & Maintenance 13 06-22-2009 09:06 PM
My Day @ Proper Course NewsReader News Feeds 0 04-10-2006 05:15 PM
Proper Course dmurcott Racing 6 06-14-2004 06:56 PM
Above Proper Course MemphisMud General Discussion (sailing related) 4 10-15-2002 09:43 AM


All times are GMT -4. The time now is 04:34 PM.

Add to My Yahoo!         
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.1
(c) Marine.com LLC 2000-2012

The SailNet.com store is owned and operated by a company independent of the SailNet.com forum. You are now leaving the SailNet forum. Click OK to continue or Cancel to return to the SailNet forum.