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Old 07-19-2016, 06:55 PM   #1
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1973 23' Safari
1970 27' Overlander
Boerne , Texas
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Checking running lights

My trailer is gutted, starting to put it back together. Working on the electrical. I've got new clearance lights, tail lights, etc, now I would like to check to see how they work. With no other electrical hooked up, no battery, grounds, etc; can I safely plug into my two vehicle to check the running lights? If not, any recommendations on how I check to make sure they work?
Greg
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Old 07-19-2016, 11:40 PM   #2
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Greg, buy two 6v lantern batteries and a black and red alligator clip lead. Clip the black to the negative of one battery and the red to the positive of the other battery. Wire the two free pos and neg posts to each other. Clip the red alligator to the pos running light wire and the black to the neg wire (assuming you have all running lights in series) they'll light up if they're working. I've used this same setup to check all my new 12v accessories - even the fans.
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Old 07-20-2016, 06:00 AM   #3
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Why not plug into tow vehicle, if any shorts worse thing would blow fuze in tv, you can also use 12volt batt. alone to check. I use jumper cables in tv to check many 12 volt items, no messing with 6 volt batts. as recommended in above post.
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Old 07-20-2016, 06:05 AM   #4
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Plug into your tow vehicle.
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Old 07-20-2016, 06:46 AM   #5
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Use a battery charger. Most new chargers will shut down if there is a short or overload. A 12 volt 6 amp charger will work just fine.
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Old 07-20-2016, 06:54 AM   #6
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TG - I like the battery charger idea. Can I just hook into the wire at the umbilical cord to check each circuit? My clearance and tail lights are grounded to the shell, so do I clip the negative from the charger to the shell?
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Old 07-20-2016, 02:17 PM   #7
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Yes. Connect the red lead of the charger to the circuit (wire) you want to check. You have a choice with the black lead. Connect it to the ground/common wire in the UCord or to a clean spot on the frame.
I would make sure the lights work from both locations to verify the ground/common circuit is complete thru the UCord.
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Old 07-20-2016, 02:22 PM   #8
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Use your tv most battery chargers wont apply power until it can sense voltage for safely reasons.
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Old 07-20-2016, 06:11 PM   #9
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Never had a problem using a battery charger to trouble shoot 12 volt electrical systems.
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Old 07-20-2016, 06:19 PM   #10
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I suggest a 12 volt battery or the two lantern batteries in series with a fuse inline on the positive (+) side. Using a battery charger could make problems for the battery charger. The cord should be wired to the standard;
https://www.etrailer.com/faq-wiring.aspx
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