Question about 1989 Ford Mustang

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My low beams won't work but my high beams do.

Someone told me it was the relay on the lighting system under the hood. where is it located and is it hard to change?

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There is no hi beam relay, you have a defective multifunction switch.

Posted on Dec 02, 2008

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The vehicle probably uses relays under the hood (year, make, model???) if it is one relay it could have bad contacts. Have someone turn beams on and off, listen under hood (key on, engine off) for a clicking sound, this will be high beam relay.

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Do the hig beams work?
Your headlamps have sepaerate fuses for each headlamp and you have a low beam relay and a high beam relay under the hood in the black box.
If everything is out, I suspect a bad headlamp switch.
Check car-part.com and look on page with * for cheapest price.

Your owner manual will identify fuses & relays.

PS, You did not recently instal high current bulbs did you? If yes, put originals back in.

HEADLAMPS

The voltage is supplied to the lamp switch through a fuse. This fuse is located in the central junction box in the left-hand footwell.
When the headlamps are switched on, a voltage is supplied to the high beam/low beam switch and to the low beam relay. The relay for the low beam is located in the battery junction box (BJB) in the engine compartment.
If the high beam/low beam switch is set to "low beam", then a voltage is supplied through the low beam relay to the low beam part of the headlamp assembly. The left and right-hand low beams are fused separately. The fuses are located in the battery junction box (BJB) in the engine compartment.
If the high beam/low beam switch is set to "high beam", then a voltage is supplied through the high beam relay to the high beam part of the headlamp assembly. The left and right-hand high beams are fused separately. The fuses are located in the battery junction box (BJB) in the engine compartment.

----------------------------------------------------------------------------------------------------------
Lamp Switch
Removal
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    Remove the lower driver's side footwell trim.
  1. Detach the lamp switch bezel.
    • Remove two screws.
  1. Remove the light switch.
    • Remove three screws.
    • Disconnect the electrical connector

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look under your hood for the fuse/relay box will be on left side behind battery. the relay and fuses will be in there check fuses also

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