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Old 11-20-2015, 04:53 PM   #1
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Toad electrical connection problem

I tow my car behind my motorhome, and yesterday when I plugged in the cord that connects the lights on the car with my motorhome, the brake lights and the right rear turn signal on the car worked but the left rear turn signal wouldn't work. I am an electrical idiot so I need help. I have a continuity tester which I've never used. I'm thinking testing the connecting cord will be the easiest, but have no idea what to do to check the socket on the cafr and/or the motorhome.

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Old 11-20-2015, 10:11 PM   #2
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You need a meter with a DC volts range, something like 0-20 volts. It will also have a continuity range.

1. With RV key off use continuity to figure out which pin is ground on the end of the cord going to the toad by testing between the metal frame of your RV and the connector.

2. Change to 0-20 volts DC range to test between the pin you figured out is ground and the other pins. If everything is good then one will "flash" DC with right signal on, different one will "flash" DC with left signal on, 3rd different one will be solid DC with running lights on. Both right and left pins will have solid DC with brake applied and turn signal off.

If you get this on the connector then the problem is inside the wiring of the Toad or bad bulb or bulbs in the toad.

Randy - Manhattan, Kansas
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Old 11-21-2015, 07:44 AM   #3
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I have a similar experience quite often. It can usually be fixed by reseating the plugs. Sometimes it requires a good spray with contact cleaner into the sockets and the plugs. Of course it could be something else but I'd start with the simple things first.
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Old 11-21-2015, 07:48 AM   #4
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What is the configuration of your plug/jacks? If a round 4 or 6 plug, the round pins can compress losing good contact. Slightly expanding the split in the pin will help.

Also, the round cylinder the pins go into have a habit of being pushed back into the receptacle body, causing poor or no connection.
Dale & Mark Bruss
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Old 11-21-2015, 08:12 AM   #5
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Reading your statement

the brake lights and the right rear turn signal on the car worked but the left rear turn signal wouldn't work.

has me asking the following questions.....
What make and model of toad vehicle are you towing? Are your rear turn signals red or yellow lamps?

You mention both brake lights work but only one turn signal. If your toad has yellow signals they have their own connections different from the brake lights. If your turn signals are red they use the same connection to activate as the brake lights AND you hazard lights (4 way flashers)

I'll be watching for further discussions.
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Old 11-21-2015, 08:26 AM   #6
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Go to Radio Shack and buy a can of contact cleaner WITH lubricant. Spray the plug and the receptacle liberally, then plug and unplug the cable to clean the contacts. This may not solve your problem, but needs to be done occasionally anyway!
Joe & Annette

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Old 11-21-2015, 08:32 AM   #7
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I had a similar situation and it turned out to be a bad converter for the tow lights.


Cliff,Tallulah and Buddy ( 1999-2012 )
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Old 11-21-2015, 09:12 AM   #8
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Have you tested the vehicle lights without it being plugged in? It could just be a bad bulb.

Buy a 12 volt test light at any automotive store and look up the diagrams. A voltmeter can fool you and since you are inexperienced it may mislead you.

Use the test light as if it is the bulb you would like to work.

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