Primus Brake Controller ER Error Code Troubleshooting

Question

Question:

My older Primus brake controller is displaying error code 7 trailer not connected, but I cant find any information as to what this means. If there is a wiring fault somewhere, Id appreciate any guidance you might be able to give as to where to look. It is an older unit, so it may just be worn out. Thanks

asked by: Kent D

0

Expert Reply:

The ER would mean there is an internal error on the inside of the brake controller that cannot be fixed. I believe that is the code you are experiencing. The brake controller will have to be replaced. The P2 # 90885 will use the same plug as the Primus so it is a great option for a replacement. It uses the latest generation of inertia sensor and is much more reliable.

expert reply by: Jameson C

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Answer 1

The VIN doesn't give me really any information beyond what you already gave so I reached out to the manufacturer. You have the 3,700 lb axle, but it has the standard 3,500 lb spindle size based on the bearing numbers they gave me for your axle. I…

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Answer 2

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 3

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 4

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 5

The OEM prep package consists of 4 "pucks" in the bed of the truck that will allow you to drop in puck style hitches for easy installation and removal, that gives you a completely clear bed when not in use. The B&W Companion OEM 5th…

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Answer 6

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 7

Hi Mike! Do you want a completely hidden hitch or one where only the receiver is visible? The Curt #C64NR you looked at has a concealed cross tube so you will only see the receiver hanging down at the rear. The Hidden Hitch by Draw-Tite #DT76GR will…

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Answer 8

Hey Lucas, It looks like both the Redarc #RED72CR and #RED68CR are going to include the same wire harness #RED99FR, but the #RED72CR is also going to include some mounting panels to make mounting the control knob into your dash easier so I'd go…

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Answer 9

It sounds like you are speaking of the wires for the brake magnets. If this is correct, you will need to connect one of the wires to the brake controller output wire on your trailer connector and the other wire will need to be grounded to a clean…

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Primus Brake Controller ER Error Code Troubleshooting

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