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Jim Grant Tech Tips Jim Grant Tech Tips
A collection of helpful articles based on reader submissions
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  Jim Grant's Tech TipsJim Grant's Tech Tips
Below is a collection of Jim Grant's Tech Tips sorted by Vehicle Make. These Tech Tips were answers to questions submitted to Jim by users over the course of many years.
If you have any questions, please feel free to email us.



Lincoln - Mercury
  Jim Grant's Tech Tips

Ford F-150, No Brake Lights
Q: I have a Ford F150 p/u truck. The brake lights will not work. Iíve replaced the switch, bulbs, cleaned all grounds and sockets!!! I have rear lights, but cannot get brake lights to work. This is not the 1st Ford truck I've had this problem on!! Got a match??

A: Save the pyrotechnic display for later. I have to ask, did you check the fuse? Did you use a test light or just look at it? One of the more effective tools in diagnosing an electrical problem like yours is a test light. The test light allows you to prove if electrical power is present in the circuit before replacing parts. With a test light, start at the fuse, then move to the stop light switch. The stop light switch should have electrical power to one terminal of the connector at all times. If not check wiring back to the fuse. When you push on the brake pedal a second and third terminal (if equipped with a third brake light) will have electrical power. You didnít provide the year of the vehicle, so I had no way of reasonably checking a wiring schematic so it makes it a little difficult to be sure but here we go. Many vehicleís brake light circuits share the same wire as the turn signal. If this is true on your vehicle, turn the directional signals on. If they work on both sides on the rear of the vehicle then the wiring and bulbs to the back are good. If the stop light switch is good and the wiring to the rear is good then you likely have a bad directional switch. Why? because the brake light circuit travels through the turn signal switch. Following a diagnostic path to prove a problem will save you vs just plugging in parts.

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