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#11563824 - 04/25/16 09:57 AM Surge brakes
redchevy Online   content
TFF Celebrity

Registered: 01/25/05
Posts: 6938
Loc: texas
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

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#11563966 - 04/25/16 11:11 AM Re: Surge brakes [Re: redchevy]
ChuChu1 Online   content
TFF Team Angler

Registered: 03/08/10
Posts: 3215
Loc: Gonzales, Tx
Surge brakes? Don't they work mechanically? Don't you put a pin in the tongue to keep from applying the brakes?
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#11564071 - 04/25/16 12:02 PM Re: Surge brakes [Re: redchevy]
Flippin-Out Offline
Extreme Angler

Registered: 02/25/15
Posts: 2141
Loc: Magnolia, TX
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.)

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#11564081 - 04/25/16 12:09 PM Re: Surge brakes [Re: ChuChu1]
Flippin-Out Offline
Extreme Angler

Registered: 02/25/15
Posts: 2141
Loc: Magnolia, TX
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.


Edited by Flippin-Out (04/25/16 12:10 PM)

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#11564134 - 04/25/16 12:28 PM Re: Surge brakes [Re: redchevy]
redchevy Online   content
TFF Celebrity

Registered: 01/25/05
Posts: 6938
Loc: texas
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.

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#11565397 - 04/25/16 09:16 PM Re: Surge brakes [Re: redchevy]
210xtreme Offline
Outdoorsman

Registered: 09/18/11
Posts: 213
Loc: Lake Fork, Tx
It should be under trailer reverse lights. Mine is in the fuse box under the hood on my 07 gmc.

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