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Ask Canuck Tech Your Own Question
Canuck Tech
Canuck Tech, Auto Service Technician
Category: Car
Satisfied Customers: 534
Experience:  Red Seal Journeyman Technician, 20 Years experience
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1990 toyota corolla: headlights..bulbs..relay and fuses when turned on

Customer Question

headlights on 1990 toyota corolla will not come on replace bulbs combo switch still nothing there is power on the relay and fuses when turned on.
Submitted: 6 years ago.
Category: Car
Expert:  Canuck Tech replied 6 years ago.

Canuck Tech :

Have you checked for power and ground at the headlight sockets, witha test light?

JACUSTOMER-cgbe6h66- :

yes therer is 12.5 voltsat the plug. but the low beam bulbs still will not light untill you ground the light ground to thre body .when you turn on the high beams ther is no voltage testing the bulbs to the battry both work fine high @ low beam

Canuck Tech :

Are you using a test light or voltmeter?

JACUSTOMER-cgbe6h66- :

voltmeter

Canuck Tech :

You can have voltage, but it is not an indication of how well the circuit will carry current. I would use a testlight. Ground it, turn the headlight switch on, and look for a bright test light. Then, put the alligator clip end on power, and test the ground circuit.

Canuck Tech :

In this case the ground is most likely the issue. Follow the wires, and I think you'll find the ground point is on the radiator support. Loosen the ground wire, give it a good wiggle to try and knock the corrosion off, and re-tighten.

Canuck Tech :

If this info has been useful, please accept. Cheers, Todd

Canuck Tech :

Any progress?