Reply
 
Thread Tools Search this Thread Display Modes
 
Old 08-24-2016, 07:26 PM   #1
3 Rivet Member
 
1973 23' Safari
1970 27' Overlander
Boerne , Texas
Join Date: Jun 2015
Posts: 145
help with 12V circuit

Rewiring my 12V circuits. I measured out one circuit, made my cuts, and soldered some splices in. I took the wire back out of the trailer to test it out before the final install. I have my hot wire and ground wire all to connected with some test lights hooked in. Altogether this is about a 60 foot run (hot + ground) and the lights pull no more than 4 amps; I am using 10AWG wire to be safe. Ran a continuity test with a multimeter and all is good. To test, I just touched the ground and hot wire to the battery terminals. The 4 lights I had hooked up barely glowed and the wire turned very hot and melted some of the insulation. I disconnected right away.

The amp pull is minimal, this is a long run, but with 10AWG this should be fine. Any ideas on what the problem is?
Glad I tested this out before putting in the trailer!
Greg
__________________

__________________
Greg1410 is offline   Reply With Quote
Old 08-24-2016, 07:29 PM   #2
4 Rivet Member
 
damonbeals's Avatar
 
1998 31' Excella 1000
1979 23' Safari
Mooresville , Indiana
Join Date: Aug 2007
Posts: 459
Shorted Bulb? It has happened to me, new out of the package and it was shorted. Also a reason why you should add a fuse. And yes 10G should be fine for only 4 bulbs.

Damon
#4827
__________________

__________________
damonbeals is offline   Reply With Quote
Old 08-24-2016, 07:47 PM   #3
3 Rivet Member
 
1973 23' Safari
1970 27' Overlander
Boerne , Texas
Join Date: Jun 2015
Posts: 145
The bulbs are fine. I hook the light fixtures only up to power (not in the circuit) and they work fine.

Could it be a bad solder job? Could it be the fact that the wires on the light fixture (only about 6 inches long) are only 14 AWG?

Greg
__________________
Greg1410 is offline   Reply With Quote
Old 08-24-2016, 08:01 PM   #4
Rivet Master
 
1974 31' Sovereign
1979 23' Safari
Wayland , New York
Join Date: Jan 2012
Posts: 1,230
Images: 3
10 gauge and 24 gauge are plenty.

Did you wire your positive and negative completely separately. They shouldn't touch electrically except through a load.

It sounds like there's a short I there somewhere. You didn't connect the very ends of the wire together thinking they had to make a loop.

Are all your positive junctions well insulated. How did you make the connections where you tap off of the main wire run? Are they well insulated? Could one of those junctions have metal touching ground?

At this point a bad solder job shouldn't cause a problem it would likely just block current flow.

Consider getting a good ratcheting crimper and not soldering. Easier and better way to make the branch connections. You can get a fairly good one for little more than $20. It produces crimps MUCH better than the crimper in the multi function pliers.
__________________
HiJoeSilver is offline   Reply With Quote
Old 08-24-2016, 08:21 PM   #5
3 Rivet Member
 
1973 23' Safari
1970 27' Overlander
Boerne , Texas
Join Date: Jun 2015
Posts: 145
HiJoe -
Thank you - I think you solved the problem. there are about 5 lights on this circuit, i put in two light fixtures to test and just wired the ground and hot wires together where the other lights were to go to make the loop. Plus I did this on my driveway, so I bet some of the joints were touching the concrete. I will put all lights in and retry.
__________________
Greg1410 is offline   Reply With Quote
Old 08-24-2016, 08:32 PM   #6
Rivet Master
 
TG Twinkie's Avatar
 
1974 Argosy 26
Morrill , Nebraska
Join Date: Nov 2009
Posts: 4,735
Images: 2
Blog Entries: 5
Concrete is not conductive. I would use a battery charger rather than a battery. Reasons are obvious. You would not have damaged the wire.
__________________
Knowledge: "A gift to be shared. A treasure to receive."
TG Twinkie is online now   Reply With Quote
Old 08-24-2016, 09:00 PM   #7
3 Rivet Member
 
1973 23' Safari
1970 27' Overlander
Boerne , Texas
Join Date: Jun 2015
Posts: 145
HiJoe:

When you ask if my positive junctions are well insulated - In a few places I have a branch coming off the main line that I soldered in. Hard to fit shrink tubing on this type of junction. Is electrical tape adequate? Other recommendations?

By the way, I hear you on the solder, I did crimp some of my other circuits and plan on doing more of this.
Greg
__________________
Greg1410 is offline   Reply With Quote
Old 08-24-2016, 09:22 PM   #8
Rivet Master
 
1974 31' Sovereign
1979 23' Safari
Wayland , New York
Join Date: Jan 2012
Posts: 1,230
Images: 3
Quote:
Originally Posted by Greg1410 View Post
HiJoe:

When you ask if my positive junctions are well insulated - In a few places I have a branch coming off the main line that I soldered in. Hard to fit shrink tubing on this type of junction. Is electrical tape adequate? Other recommendations?

By the way, I hear you on the solder, I did crimp some of my other circuits and plan on doing more of this.
Greg
Electrical tape is just ok. Wrap it really well. This I would recommend only if you can get all the wires to lay in line and then branching from the end of the tape. Wrap the tape several inches either side of the junction. I highly recommend Scotch 88 electrical tape, available most good hardware stores. I'd recommend one layer of friction tape on the outside of the electrical tape, it's usually found near the electrical tape.
__________________
HiJoeSilver is offline   Reply With Quote
Old 08-24-2016, 09:39 PM   #9
Rivet Master
 
1974 31' Sovereign
1979 23' Safari
Wayland , New York
Join Date: Jan 2012
Posts: 1,230
Images: 3
"just wired the ground and hot wires together"

Yep that'll do it. Perfect short circuit.

I hate to have to recommend this, but since you're at a point when it's easy to do and since you mentioned some insulation melting you should really replace the wires. There's no good way to be sure of the integrity of the wiring insulation at this point. It could be damaged on the inside and not visible on the outside.

Since you can do this wire assembly outside the trailer, put on the game and relax making some new connections.

For future tests consider getting an inline fuse holder available at auto part stores and twist it on to the end before connecting to the battery to provide temporary protection before putting into the trailer.

I know it sucks but good lesson learned the easy way.
__________________
HiJoeSilver is offline   Reply With Quote
Old 08-24-2016, 10:17 PM   #10
3 Rivet Member
 
1973 23' Safari
1970 27' Overlander
Boerne , Texas
Join Date: Jun 2015
Posts: 145
thanks for your help. I will get that inline fuse.
__________________

__________________
Greg1410 is offline   Reply With Quote
Reply

Tags
12v


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

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
'73- Crossed 12V circuit wiring? TomsEid Lights - Interior & Exterior 0 01-25-2015 11:31 PM
12v 20A circuit keeps blowing blade fuse rayandre Lights - Interior & Exterior 1 08-08-2013 07:04 AM
12V circuit breaker ? batt Batteries, Univolts, Converters & Inverters 5 03-07-2012 10:57 PM
Contemplating adding a new 12V circuit Boondocker Electrical - Systems, Generators, Batteries & Solar 3 11-08-2009 03:53 PM
circuit breaker for 12v stays off airhaus Batteries, Univolts, Converters & Inverters 6 06-06-2009 11:38 AM


Virginia Campgrounds

Reviews provided by



Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 11:51 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.

Airstream is a registered trademark of Airstream Inc. All rights reserved. Airstream trademark used under license to Social Knowledge LLC.