Just replaced the headlight bulbs in a 98 Grand Cherokee that had the same problem. It had the wrong bulbs in it. It had 9007's in it. Calls for 9004's.
Lowbeam is an H7, highbeam/DTR is also H7
I'm having the exact same problem. Does anyone know what is causing this?
I have to suggest the light switch is bad. A simple voltmeter or test light may help you test voltages. I have to suggest the light switch is bad. A simple voltmeter or test light may help you test voltages.
The circuit requires the hi/lo switch. You'll need to get a replacement switch for everything to complete the headlamp circuitry.
just behind the headlamp lens assemblies you'll find little plastic doors that you open to access the bulbs,.... pay attention to the location of the lowbeam bulb lens before you open the doors or you'll be replacing the highbeam bulbs. it's straighforward from there--just unplug the old bulb, plug in the new one and shut the little plastic door.
blown fuse/blub on the lowbeam is pop/wiring is messed up
1) Open front hood. 2) Twist lowbeam connector from back of headlight casing. 3) Twist apart bulb from the connector. 4) Replace with new bulb. 5) Reverse order of above steps to finish.
Turn your headlight switch to the "on" position. disconnect the power wires from the bulbs and use a volt meter to find which ones have voltage. if your highbeams are off, then the wires with voltage are your normal driving lights. the ones without power are your highbeams. also. positive and negative don't really matter with lights. just so long as there is current running through the fillament. there is usually only one way the plug will fit the lights anyways.
For 1986 Vanagon: 1. Remove plastic grill - 5 screws. 2. Remove entire metal cage surrounding light - 4 screws. 3. Unplug highbeam and lowbeam lights. 4. The white plastic things sticking through 3 of the 4 holes can be tapped out gently with a hammer, hitting the white plastic from the front.
I had this problem on an '02 525i. The socket in the wiring plug was corroded. Replaced it and no problems since, over 1 year now.
The bulbs screw in from the rear and if you can't get to the rear, you have to take the light assy off.
If both lowbeam headlights fail at once, it probably isn't the lamps themselves. That would be a fluke. The wiring is usually not at fault. It is vulnerable at the ends where the connectors are because they might become corroded. Check that last. That leaves the two other vulnerable points in the circuit: the fuse and the light switch. Check them out.