maxo
New member
left light lights up, but does not flip. How can you tell if motor is not working or the bushings are worn??
88 left light
- Thread starter maxo
- Start date
E
ecss
Guest
On top of the motor is a knob.
If you turn the knob counter clockwise the headlight bucket should open.
Takes a lot of turning but the movement should be smooth. If there is a lot of slippage
the bushings are worn.
If the bushings are worn you will still hear the motor run for a few seconds when you
turn the headlight switch to the head position.
Follow the two wires from the motor and unplug the two pin plug.
Apply a fused 12 volts to the motor connector plug.
To make the motor go in the opposite direction you reverse the wire polarity.
If the motor doesn't rotate when you apply 12 volts to it the brushes could be worn out.
Measure the resistance at the two pin connector plug.
Compare the resistance to the passenger side motor.
This verifies the motor brushes are good.
If all of the above check out.
The headlight control module is under the hood bolted to the front of the driver side plastic wheel well housing,
It has two connectors. One of the connectors has 5 wires.
The other connector has 4 wires and go to the two headlight motors.
Unplug the 5 pin connector and should measure the following voltages. Use Pin D Black wire for
you meter lead ground. Measure the Pin E Red wire. Should be 12 volts.
Pin A is a Yellow wire and has 12 volts on it when the headlight switch is in the Head position.
Pin B is a Red wire and has 12 volts on it all the time. This voltage is used to open the RH headlight bucket.
Pin C is a White wire and has 12 volts on it when the headlight switch is in the Off position.
Pin D is a Black wire and is ground for the module.
Pin E is a Red wire and has 12 volts on it all the time. This voltage is used to open the LH headlight bucket.
If the motor runs with 12 volts applied and the motor rotates smoothly when you turn the knob
and Pin E Red wire measures 12 volts the headlight control module is probably bad.
If you turn the knob counter clockwise the headlight bucket should open.
Takes a lot of turning but the movement should be smooth. If there is a lot of slippage
the bushings are worn.
If the bushings are worn you will still hear the motor run for a few seconds when you
turn the headlight switch to the head position.
Follow the two wires from the motor and unplug the two pin plug.
Apply a fused 12 volts to the motor connector plug.
To make the motor go in the opposite direction you reverse the wire polarity.
If the motor doesn't rotate when you apply 12 volts to it the brushes could be worn out.
Measure the resistance at the two pin connector plug.
Compare the resistance to the passenger side motor.
This verifies the motor brushes are good.
If all of the above check out.
The headlight control module is under the hood bolted to the front of the driver side plastic wheel well housing,
It has two connectors. One of the connectors has 5 wires.
The other connector has 4 wires and go to the two headlight motors.
Unplug the 5 pin connector and should measure the following voltages. Use Pin D Black wire for
you meter lead ground. Measure the Pin E Red wire. Should be 12 volts.
Pin A is a Yellow wire and has 12 volts on it when the headlight switch is in the Head position.
Pin B is a Red wire and has 12 volts on it all the time. This voltage is used to open the RH headlight bucket.
Pin C is a White wire and has 12 volts on it when the headlight switch is in the Off position.
Pin D is a Black wire and is ground for the module.
Pin E is a Red wire and has 12 volts on it all the time. This voltage is used to open the LH headlight bucket.
If the motor runs with 12 volts applied and the motor rotates smoothly when you turn the knob
and Pin E Red wire measures 12 volts the headlight control module is probably bad.
Last edited by a moderator:
- Thread starter
- #3
maxo
New member
88
thank you ecss this should help !left light lights up, but does not flip. How can you tell if motor is not working or the bushings are worn??
Similar threads
Corvette Forums
Supporting Vendors
Dealers:
