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Tow vehicle electrical from coach
On my tow vehicle behind the coach. The current wiring that works on my Monaco executive is that both the left and right turn signal wire only are energized when you turn the left or right turn signal on. And that the brake and hazard lights when engaged, then uses both the left and right turn signal wires. The parking lights are on a seperate wire. So I have 4 wires, left signal, right signal, parking lights and a ground that connects to the plug-in.
Now. On the back of the h3-45 I have 2 plugs.
Plug 1:
the left and right wires are energized at all times that the ignition is on, and my exec they are not, so on my tow vehicle the brake lights are always on. If I turn on my left turn signal, the left light blinks and the right stays on as a brake light.. If I turn on my right turn signal the right blinks and the left stays on as a brake light. If I do not have a turn signal on both lights are always on as a break light.
Plug 2:
The left and right turn signal works just like my exec. The left and right are only energized when the turn signal is engaged, but the problem that I know have is, that my brake light never engages. I test tall he wires on the plug with a 12v light tester and none of the wires are energized when I push the brake.
So, plug 1 I always have brake lights, and plug 2 I never get brake lights….
Also, on the back of the coach, some of the lights are on when the ignition is on, day or night. And the previous owner has a brake booster at the drivers area.
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5 Replies
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Greg,
Standard 4, 6 and 7 pin trailer connector wiring can be found at http://www.etrailer.com.
If you have a pin that’s always hot it could be the charge or brake controller conductor. There should otherwise not be a constant voltage on any pin when the lighting circuits aren’t energized. What’s not right is that you can’t find a pin that’s hot when the brakes are applied. This should be on a single pin (non standard) or on the same pins supporting the left and right turn signals. You did say some rear coach lights are always on. i hope these aren’t the brake lights. Regardless, of what they are they too could be source of the constant 12V.
Many of the converters have a control board to provide isolation to the tow plug so a short in the tow doesn’t affect coach systems. It also may have jumpers or dip switches to allow you to configure the plug to support dedicated brake lights on the tow or combined use bulbs for brakes and turn signals. This is referred to 2 or 3 wire systems.
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Well, I keep learning….
On my Monaco Exec. when the parking brake is set it does nothing in regards to the brake lights. My H3 when the parking brake is set then the brake lights are energized. So, when I pulled the parking brake and tested the lights all is good…..
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Give me your email address and I’ll email you the schematic in PDF of the Vantare Tow Plug wiring and the circuit board assembly we utilized.
Ben Cummings
Parliament Motor Coach -
See if this helps.
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Ben… I would like a copy of that pdf please.
Thanks.. Diane
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