Question about 1994 Nissan Altima
The headlamp bulbs in these vehicles have 2 filaments- one for high beam and one for low beam.
Remove the bulb- being careful not to touch the glass part (oils from your skin can get on the glass and can actually cause hot spots and shorten the life of the bulb). You can see there are 3 wires in the connector. One will be ground. Using a test light, hook the clip to the poistive battery terminal and touch the pointed end to the metal contacts for each wire in the connector. One should complete the circuit and light the test light- ground is ok then. Now put the clip of your test light on the negative battery terminal. Turn the headlight switch on- high beam. Touch the point of test light to the terminals again and one should light- that's ok. Now make sure that the last wire completes a circuit when the headlamps are on low beam. If this checks out, look at the bulb and see if one of the filaments is broken. If your electrical checks aren't ok, check fuses- these are most likely ok, leading to a headlamp switch.
I was a tech in a Nissan dealership for 10 years and am an ASE certified Master Tech with L1 and X1 certs. and am a certified Nissan Scope Tech. I've seen this problem a few times.
Posted on Oct 29, 2008
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