1996 Dodge ram 2500. Both dashboard lights and headlights went out at the same time. All other electrics work. All fuses seem to be good. What would cause this and how do I fix it?
Both the dash lights and headlamps, including the tail lights are fed through a fuse link under the bonnet, then the tail, dash lights are run through fuses as are the headlamps. Firstly, check the fuses electrically not visually. Use a test probe (available from your local auto parts shop, not expensive) and clip one end to a good ground on the vehicle chassis and use the pointy end to check both ends of each fuse, the test lamp should light up on BOTH ends. If it lights up on one end only, then that fuse has failed and should be replaced. If it does not light up at either end of the fuse, that circuit is without power so turn on the ignition and lights but DO NOT start the motor. Then check the fuses again. If all looks good, locate the light relays which could be under the hood in their own enclosure or plugged in under the dash and check each one for inputs and outputs. If the relay pins are numbered, you should have power to pins 85 OR 86 but not both and 30. Pins 85 and 86 are the coil connections and a power supply and ground connection to these pins should turn the relay on (you should hear a click) pin 30 is the main load supply and pin 87 is the output supply. This means that pin 87 should be active whenever the relay is turned on.
power missing from pin 30, check fuses and fuse links. Power at pin 30 but not at pin 87 when the relay is on, replace the relay. Essentially, the light switch turns on the relay and the relay switches the power to the lights, one relay for dash and tail and two relays for the headlamps (high and low beam). You may find that the vehicle has two headlamp relays for each side headlamps, a high and low beam for the right side lights and the same for the left. If you have no power to one of the switching connections (85 and 86) then again check fuses and check the light switch itself.
Jan 10, 2010 |
1996 Dodge Ram 2500 Club Cab