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Old 09-10-2013, 08:53 PM   #1
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Question Seven Pin Tow Wiring

Can someone tell me if the standard seven pin MH to Tow connector wiring will provide battery charging to the tow while towing?
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Old 09-10-2013, 09:11 PM   #2
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There is a pin available for this

However unless it is connected to the coach batteries via a auto resetting 20 amp breaker and similarly connected in the car, also using a breaker you will not be charging the car.
Pin 4 is for this purpose.
You could use a test light to see if your coach is wired. Should do it with ignition on as it is possibly wired via the rear sub board in the engine compartment
If wired correctly it should be at 1 o'clock
Best of luck.
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Old 09-11-2013, 07:15 AM   #3
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Totally agree with SteveSkinner. . .it depends on how the rv technition wired the plug.
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Old 09-11-2013, 11:58 AM   #4
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Quote:
Originally Posted by Red James View Post
Totally agree with SteveSkinner. . .it depends on how the rv technition wired the plug.
I agree totally. Someone could have interpreted the schematic incorrectly or, just goofed up in the wiring. So, I always check with a test light to see what pin does what and, ignition on and off.
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Old 09-11-2013, 01:02 PM   #5
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Thanks for the feedback. Ill be talking with the installer. Im pretty sure there are no breakers installed, so may have not wired the tow for battery charging.
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Old 09-11-2013, 01:13 PM   #6
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one of the pins on the 7 pins (Should be either to the right or left of the top pin depending on how you are looking at it) is color coded BLACK and identified as BATTERY.

The other one is for the tail lights.

The top pin is GROUND

From a known ground (Often the bracket the socket is mounted on, but not always) using a test lamp or volt meeter, probe for voltage. Both tail lights on ignition off (To identify the pins) and the other way around.

NOTE: When it comes to a professional technician wiring the thing up.. ASSUME a screw up.. You may be wrong, but you won't be sorry.. If you ASSUME he did it right, ... Well in that case Wrong = Sorry.
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Old 09-11-2013, 01:24 PM   #7
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You may want to print the info on trailer wiring from here. There is no "top" pin on the 7 blade connector which is the one used on motorhomes.
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