Brake Lights, Turn signal lights, marker lights, oh my! - Page 2 - Fiberglass RV


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Old 11-18-2012, 03:59 PM   #15
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It appears that Etrailer recommends that you also should use the above listed product with the following part. I am not sure I entirely understand why, but maybe this is where Frederic wend wrong? Thoughts?

Tail Light Isolating Diode System with Wiring Harness Hopkins Tow Bar Wiring 38955

...or maybe this is just a towbar issue that only comes up when you pull a car ?
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Old 11-18-2012, 04:14 PM   #16
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It appears that Etrailer recommends that you also should use the above listed product with the following part. I am not sure I entirely understand why, but maybe this is where Frederic wend wrong? Thoughts?

Tail Light Isolating Diode System with Wiring Harness Hopkins Tow Bar Wiring 38955

...or maybe this is just a towbar issue that only comes up when you pull a car ?

I think that the diodes isolate the two vehicles electrical systems. For a trailer, just the adapter module should do the trick.
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Old 01-02-2013, 09:45 PM   #17
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Red face It took me HOW LONG to figure it out???

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Originally Posted by glamourpets View Post
Frederic claims the adapter didn't work. It MIGHT be an issue of incorrect wiring.

Is anyone else using this unit successfully?
If there's a screwed up way to do something, I'll find it first!
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Output
  • One wire goes to the brake lights.
  • One wire goes to the left turn signal
  • One wire goes to the right turn signal

I think the module's internal circuit senses when both turn signal wires are powered and diverts the power to the brake lights. When just one side is powered (for turn signal) it passes the power to the appropriate light. When you step on the brake, the module clicks, indicating a mechanical relay inside.
All I cared about were the turn signals. I never connected an actual light to the output brake wire. Once I added a concealed brake light near the terminal strip inside, the turn signals work perfectly!
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Old 01-03-2013, 06:46 AM   #18
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All I cared about were the turn signals. I never connected an actual light to the output brake wire. Once I added a concealed brake light near the terminal strip inside, the turn signals work perfectly!
Great news. I wouldn't feel bad about it, as I don't recall the instructions saying that all three wires need to be connected for it to function. And it is a black box, so who knows the exact logic of the circuit?
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Old 01-03-2013, 07:34 AM   #19
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I'm curious, is there a delay between the time the tow vehicle turn signal starts to work and the trailer turn signal starts to work? Raz
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Old 01-03-2013, 10:10 AM   #20
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I'm curious, is there a delay between the time the tow vehicle turn signal starts to work and the trailer turn signal starts to work? Raz
They appear to be simultaneous.
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