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Surge brakes #11563824 04/25/16 02:57 PM
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redchevy Offline OP
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Anyone know what fuse etc. is missing/not connected on a 2004 GMC 2500 HD with d-max that the surge brakes don't cut off when you put it in reverse?

I checked on my truck and the center post which is supposed to be hot when you put it in reverse reads 12 volts and the surge brakes do cut off when in reverse. On the old mans pickup it doesn't read hot when you put it in reverse and thus the surge brakes lock up when you try to back up.

Thanks for any help, I haven't googled it yet, thought maybe it was a commone easy answere.

matt

Re: Surge brakes [Re: redchevy] #11563966 04/25/16 04:11 PM
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ChuChu1 Offline
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Surge brakes? Don't they work mechanically? Don't you put a pin in the tongue to keep from applying the brakes?


Snowflakes and entitled brats will be the doom of America!


Re: Surge brakes [Re: redchevy] #11564071 04/25/16 05:02 PM
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RedChevy, you are on the right track as far as what your dad's truck problem is. Look in the owners manual. The fuse location info there is often enough to help locate it. Typically, the isolation fuse for the trailer connections is in an under-hood fuse block. (At least it has been on all the Chevy's I've owned over the past 15 years.)

Re: Surge brakes [Re: ChuChu1] #11564081 04/25/16 05:09 PM
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Originally Posted By: ChuChu1
Surge brakes? Don't they work mechanically? Don't you put a pin in the tongue to keep from applying the brakes?


ChuChu, you would be correct for older surge brake systems with drum brakes. The drum brakes actually were so inefficient, you could back up anyway, even if you didn't bother putting the lock-out in in place on the tongue's actuator.

Modern bass boat trailers almost always have disc brakes. They are so efficient that they will bind up, lock-up and actually damage the brake system if the pressure is allowed to build. Manually pinning the actuator every single time would be pain overlooked by some, causing damage. The solution is an electrical solenoid that opens a valve for directing fluid back to the master cylinder. This way, the brakes are disabled every time the trailer is backed up. That solenoid is powered by the Reverse wire from the tow vehicle. This is why modern trailers have 5 wire lead connections instead of 4. Putting the vehicle in reverse always disables the surge brakes in this manner.

The surge-actuated brakes are still mechanical - it's only the disable feature for backing up that's electrical.

Last edited by Flippin-Out; 04/25/16 05:10 PM.
Re: Surge brakes [Re: redchevy] #11564134 04/25/16 05:28 PM
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redchevy Offline OP
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We have had all kinds of trailers, but they either had electric or no brakes.

Ill peak in the owners manual and see what it has to say.

Re: Surge brakes [Re: redchevy] #11565397 04/26/16 02:16 AM
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It should be under trailer reverse lights. Mine is in the fuse box under the hood on my 07 gmc.

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