Testing Wiring?

Submitted: Monday, Aug 06, 2012 at 10:15
ThreadID: 97283 Views:1859 Replies:7 FollowUps:2
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Is there any way to test the trailer wiring in a car, without a trailer?

Our car had wiring in place, If its brake, light or both, is there any way we can test it without having something to actually test it on? we are looking at caravans to buy and would like to know if the wiring works before we try to drive one home.

Cheers :)
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Reply By: Member - Stuart P (WA) - Monday, Aug 06, 2012 at 10:33

Monday, Aug 06, 2012 at 10:33
you can buy trailer plug testers from most car parts sellers ,they plug into your trailer plug and leds light when the circuit is activated, they some times wont show up a bad earth due to the leds
AnswerID: 492360

Reply By: Member - Rob K (VIC) - Monday, Aug 06, 2012 at 10:34

Monday, Aug 06, 2012 at 10:34
Hi Angie M,

Most of the caravan service and repair companies can test the car plug with a testing unit - just go down to your local company and I'm sure they'd help.

Cheers

Rob K
AnswerID: 492361

Reply By: Member - Scott M (NSW) - Monday, Aug 06, 2012 at 10:37

Monday, Aug 06, 2012 at 10:37
This link has a great array of pin & socket wiring in Australia

http://www.narva.com.au/products/browse/wiring-diagrams

A simple cheap 12v current tester from Dick Smith - earth and in the pin hole should do the trick - get a friend to trip the brakes, blinkers, parking, lights and reverse to test if current is flowing to the correct pins.

Of course - this doesn't guarantee the trailer or caravan has been wired correctly - can only chek that when you plug it in....
AnswerID: 492362

Reply By: Trev6 - Monday, Aug 06, 2012 at 10:38

Monday, Aug 06, 2012 at 10:38
Hi Angie M,

You could use a test light and that will tell you if there is power at the plug, get a friend to work the brake , lights, blinkers ect while you test each circuit at the plug and it will show if the plug has been wired correctly and if any circuits are faulty.

If you can connect the alligator clip of the test light to the earth socket of the plug then use the pointy end of the test light for the other sockets it will tell you if the earth return is good as well.

hope this makes sense

Trevor
AnswerID: 492363

Follow Up By: Bush Wanderer - Monday, Aug 06, 2012 at 23:49

Monday, Aug 06, 2012 at 23:49
A bit safer to use a multimeter as opposed to a test light. Test lights have been known to set off the airbags....if so equipped.

BW.
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FollowupID: 768101

Follow Up By: Member - Stuart P (WA) - Tuesday, Aug 07, 2012 at 10:44

Tuesday, Aug 07, 2012 at 10:44
test lights on a trailer cicuit will not deploy airbags!!!!!!!!!!
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FollowupID: 768129

Reply By: Angie M - Monday, Aug 06, 2012 at 10:41

Monday, Aug 06, 2012 at 10:41
Thank you all for such speedy and helpful responses!!
AnswerID: 492364

Reply By: Bushranger1 - Monday, Aug 06, 2012 at 10:42

Monday, Aug 06, 2012 at 10:42
Hi Angie
If you have a multimeter & know how to use it you can check each circuit using this diagram according to your socket configuration.

Socket pinouts
AnswerID: 492365

Reply By: Roughasguts - Monday, Aug 06, 2012 at 11:15

Monday, Aug 06, 2012 at 11:15
Don't forget your electric brake wiring!!

You gonna have to get a Brake controller installed if you want caravan brakes.

Cheers
AnswerID: 492370

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