Troubleshooting Tekonsha Mark 12 Brake Controller

Question:

Blue wire at the controller brake on shows 2v Manually put on brake using controller switch 12v

asked by: David P

Expert Reply:

The Tekonsha mark 12 brake controller is a pretty old controller. On ebay people are selling them as "vintage" brake controllers which is pretty funny. It sounds like the gain needs to be adjusted up since it can put out 12 volts when you use the manual override lever but only 2 when you use the brake pedal. Try to adjust the gain or power setting higher to see if that makes it put out more voltage.

If not, then due to the age of the controller I would not be surprised if it has internal damage and needs to be replaced.

For a brake controller I would recommend the Prodigy P3 Brake Controller part # 90195. This is our best selling brake controller because of how well it works and how easy it is to setup. This is a proportional brake controller that senses the amount of braking the tow vehicle is applying and applies a proportionate amount to the trailer brakes. This will be the last brake controller you buy. It can easily be transferred to future vehicles as well.

expert reply by: Jameson C