Tekonsha Primus IQ Shows Voltage Without Trailer Connected

Question

Question:

I purchased a vehicle with this brake controller already installed. When I am sitting in my vehicle no trailer attached currently reading 0.9. As u drive the numbers are constantly changing on and off the gas and we have used it with our snowmobile trailer attached and brakes controller not working. Can this be corrected or junk it and get a new one?

asked by: Darin W

0

Expert Reply:

I didn't catch what vehicle you were using the Tekonsha Primus IQ Trailer Brake Controller part # TK90160 on but what I recommend you do is cut the blue wire from behind the controller and then turn up both the boost/gain to the max settings. Then once the settings are set to max apply the manual override and test the blue wire with a multimeter. It should show 12 volts here but only when the manual override is applied.

If it doesn't show 12 volts or does so when the manual override is not applied then odds are the brake controller is bad or you have a faulty connection with the stop light switch. If the stop light switch wire looks good then replace the controller. I recommend using the Tekonsha Prodigy P3 Trailer Brake Controller part # 90195. The main difference between the Primus IQ and Prodigy P3 is that the Prodigy P3 gives you the ability to store settings for up to 5 different trailers.

If you get 12 volts when testing the blue wire behind the controller with only the manual override applied then you most likely have a short on the blue brake output wire that runs from the brake controller back to the 7-way trailer connector and it will need to be traced to check for shorts or replaced with part # 10-1-1 (per foot).

expert reply by: Conner L

0

Answer 1

Yes, we do have a generic brake controller wiring diagram on our Brake Controller Information page. I have added a link to it below. The bundle of wires you are looking for should contain the following: white with red stripe, blue with white…

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Answer 2

The only wires that could be hot all the time on a trailer connector is the 12-volt hot lead, which is usually a black wire, and, if applicable, the auxiliary power wire, which is normally yellow or purple. The blue wire is usually for electric…

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Answer 3

Your Dad's 1500 must be a 2012 and the harness must be #3021-P. Dodge changed the electrical system on the Ram trucks starting in the 2013 model year to what they call the Powernet. It is a multiplex type of system and all that means for you…

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Answer 4

If you are looking for the fuses on your 2015 Chevrolet Silverado 1500 that are tied to your trailer wiring then those will be in the fuse box in the engine compartment. You can find this information as well as a list of what all the fuses are tied…

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Answer 5

There is no plug-in wiring adapter for a brake controller on a 2019 Chevy Colorado; most brake controllers such as the Prodigy P3 #90195 will need to be hardwired into the vehicle. For this you can use the Replacement Brake Control Plug-In Harness…

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Answer 6

A 4-Way trailer connector has the basic lighting functions only; running lights, left turn signal and brake lights, right turn signal and brake lights, and ground. A 7-Way has these functions and a 12 volt circuit, a circuit for electric trailer…

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Answer 7

In order to determine the torque rating for the lug nuts on your trailer you will need to know check out the chart I attached that shows all of the torque specs for all the trailer lugs available based on stud size, wheel material and wheel size.

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Answer 8

The difference between the Class II and Class III hitches has to do with their Gross Trailer Weight (GTW), their Tongue Weight (TW), and their Hitch Receiver Size. Class II trailer hitch receivers have a 1-1/4 inch receiver and can be rated up to…

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Answer 9

The difference between an load range C and load range D tire in the same size is the capacity and psi rating. The two tires will still have the same dimensions and fit on the same wheel. The D rated tire has a higher capacity. For a ST175/80D13 like…

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Answer 10

Load range B trailer tires are going to have a lower capacity than C load range tires. Basically that, psi rating, and the ply rating are the only differences. A higher load range tire would last a little longer than lower load ranges of the same…

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Answer 11

If you just need a 4-pin to 7-pin trailer wiring adapter, then you can use part #C57672. This will plug into the 4-pin trailer connector on your brother's vehicle and give him the 7-pin socket for the trailer. Keep in mind, this will only give…

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Answer 12

Your math is correct in your trailer weight load example. If a fully-loaded tandem axle trailer weighs 4000-lbs then each of the 4 tires will bear 1/4th of that load, or 1000-lbs. In this case a tire rated for 1300-lbs would provide a good safety…

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