Troubleshooting Flashing Lights on Curt Spectrum Trailer Brake Controller

Question

Question:

My Curt 51170 brake controller I purchased the lights on the dial constantly flashes! no trailer attached,

asked by: Gary D

0

Expert Reply:

According to the instructions for the Curt Spectrum Trailer Brake Controller # C51170 there are 2 reasons why the lights should be flashing.

The first is if it's flashing red and yellow which means the brake controller is overloaded or there is a short-circuit somewhere on the brake controller line. To remedy this you'll need to check your wiring and connections and fix the short.

The second is if it's flashing blue and this indicates that the trailer has been disconnected or if the brakes are pressed with no trailer connected. To remedy this you'll need to check your trailer connector and wiring for any damages.

expert reply by: Jon G

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Answer 1

If you are getting a constant 3.4 volts on the brake output circuit of your brake controller without the brake pedal pressed that's a malfunction of the brake controller. Curt controllers are known to be a bit more prone to internal bugs so…

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Answer 2

The calibration process of the Curt Spectrum #C51170 should only happen after initial installation and should be run before you plug in the trailer to your tow vehicle. You should have seen the green lights on the knob light up in a clockwise motion…

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Answer 3

With a trailer disconnected the Curt Spectrum part #C51170 that you referenced should have the outer two lights flashing blue at idle or solid blue when the brakes are on. Since you used the correct install harness for this controller in your 2010…

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Answer 4

All the brake controller needs to sense a trailer connection so that you can test it is a slight amperage draw on the output circuit. For that you can use a circuit tester like the part #PTW2993 with one pin grounded and the other on the output pin.…

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Answer 5

It could be a tow package fuse on the vehicle. Use the owners manual to find the locations of fuses/relays related to the tow package wiring to check them and replace as needed. If the issue is not a fuse or relay then you can test the vehicle side…

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Answer 6

If your current springs have 5 leaves then going to a 7 leaf spring will increase the height of the trailer a little and make the trailer more susceptible to sway. Regarding capacity if you go with springs rated higher than what is required it will…

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Answer 7

To determine the size of the brake assemblies you need you have to measure the depth and width of the hub drum on the axle like what you see in the picture I attached. The most common size is 2-1/4 inch wide like the #T4071600-500 that you…

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Answer 8

Since Demco uses 3,500 drum brake assemblies part #DMSB24429M and #DMSB24428M what you'd need is similar 3,500 electric brake assemblies like the etrailer part #AKEBRK-35L-SA for the left hand side and #AKEBRK-35R-SA for the right hand side. To…

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Answer 9

The correct replacement master cylinder kit we have for your Demco setup is the part #DM5918 which comes with the lock out replacement.

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Answer 10

I did some checking and the hub/drum we offer that will work for you is the part #8-430-5UC3. This uses the same bearings as the 8-415 and will be an exact fit aside from the fact this is a non-ABS setup and the 8-415 came in an ABS setup and non-ABS…

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Answer 11

The installation instructions for this product are recommended for individuals who have experience winding torsion springs. If you have not worked with a torsion spring system before, we recommend contacting a local garage door company to install…

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Answer 12

The number you provided, "7753400" is a patent number which corelates to the Equalizer for E-Z Flex Suspension part #013-144-03. This is for a single equalizer but if you need the entire kit it's the Dexter E-Z Flex Suspension Kit part…

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Troubleshooting Flashing Lights on Curt Spectrum Trailer Brake Controller

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