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Old 10-26-2009, 11:56 PM   #1 (permalink)
supv26
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New trailer plug/service braking system

We have a very small bumper hitch trailer we pull from time to time and the last time out the plug came out and got dragged on the highway. There ain't much left of it now. This little trailer does not have brakes. My truck is a 2009 3500HD 4X4 CC DRW Duramax/Allison.

The trailer has a 4 pin flat plug and in order to plug it in I was using a factory GM 4 pin to 7 pin adapter. The adapter would stay in the socket good but the plug from the trailer would fall out.

Anyway, I just went and bought a 7 pin trailer plug and just hooked up the four wires inside the new plug leaving the other three with nothing hooked to them. I made sure I followed the little diagram on the socket lid and attached all the wires accordingly.

Now, when I hooked up, everything works perfect, ie, tail lights, turn signals, 4 ways, clearance lights and brake lights. The thing now is the DIC will chime and say, service trailer brake system.

Did I do something wrong? There is no brake wire hooked to the inside of the new plug going to anything. The only thing I can think of is the old adapter plug didn't even have a slot in it that would even touch the prong in the socket. I am thinking that since the new plug has a prong in it touching in the socket, it is telling the brain there must be a wire broken or unhooked.

Any ideas????

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Last edited by supv26; 10-27-2009 at 12:09 AM. Reason: edit
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Old 10-27-2009, 12:10 AM   #2 (permalink)
heymccall
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You've got one of your wires transposed/ misplaced. The brain ain't that smart. It's seeing a connection to ground on the trailer brake activation wire. It may actually be grounding through a filament.

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Old 10-27-2009, 11:00 AM   #3 (permalink)
supv26
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thanks for the response.... i took the plug apart again and checked it. i have them hooked up according to the diagram on the socket lid. the only one i am not sure of is the white wire, ground. i have it hooked to the spot marked with the minus (-) sign. nothing is touching other 3 spot. they are for trailer brake, (+) and the center pin which is back up lights.
thanks.....
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Old 10-27-2009, 12:36 PM   #4 (permalink)
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White - Ground goes at 7 O'Clock
Brown - Parking light goes at 11 O'Clock
Yellow - Left TRN/BRK goes at 9 O'Clock
Green - Right TRN/BRK goes at 3 O'Clock

Does it say Service Trailer Brake when unplugged?
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Originally Posted by GetSome8.1HD
Its not like I said I enjoyed reading Good Housekeeping while taking a candle lit bubble bath then proceeding to using a loofah with exfoliating creams all while thinking about you . Now THAT would be creepy
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Old 10-27-2009, 02:35 PM   #5 (permalink)
supv26
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when I unplug it does not say that on the DIC. Only when I plug it in it tells me to service the trailer brake system.
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Old 10-27-2009, 02:44 PM   #6 (permalink)
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I also checked with your info and I have them hooked up just like you posted
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Old 10-27-2009, 08:20 PM   #7 (permalink)
heymccall
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Something is amiss in your new 7pin plug, then. A single loose copper strand somewhere out of place or a manufacturing defect in the plug itself.
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Brian
'13 Hyundai Genesis Coupe handshaker
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Quote:
Originally Posted by GetSome8.1HD
Its not like I said I enjoyed reading Good Housekeeping while taking a candle lit bubble bath then proceeding to using a loofah with exfoliating creams all while thinking about you . Now THAT would be creepy
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Old 10-28-2009, 12:20 AM   #8 (permalink)
supv26
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Originally Posted by heymccall View Post
Something is amiss in your new 7pin plug, then. A single loose copper strand somewhere out of place or a manufacturing defect in the plug itself.
Thanks for the info.
I may take the plug back and tell them it is defective and see if another one will work.

I just hope it is not hurting anything in the trailer braking system in my truck.
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Old 10-28-2009, 12:23 AM   #9 (permalink)
heymccall
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Quote:
Originally Posted by supv26 View Post
Thanks for the info.
I may take the plug back and tell them it is defective and see if another one will work.

I just hope it is not hurting anything in the trailer braking system in my truck.
You could always undo the wires from the plug and try it???(just the plug, like when you pulled it out of the packaging)
Also, the system is designed to handle shorts to either 12V or ground (when grounded, one of the underhood fuses pops). The only thing that happens is that it irritates the driver by taking over the display on the instrument panel.
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Brian
'13 Hyundai Genesis Coupe handshaker
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Quote:
Originally Posted by GetSome8.1HD
Its not like I said I enjoyed reading Good Housekeeping while taking a candle lit bubble bath then proceeding to using a loofah with exfoliating creams all while thinking about you . Now THAT would be creepy
Member #21 of the OiO association

Last edited by heymccall; 10-28-2009 at 12:23 AM.
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Old 10-30-2009, 07:03 PM   #10 (permalink)
supv26
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Fixed!!

I blew a 30 amp fuse in the box under the hood. I took it to a dealer for another issue and he fixed this for me too. I tried to pay im for it but he said it was under warranty!

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