Roy Rabold

My headlights will go up but not down. I replaced the motor, the switch, and the relay. I checked the fuses and all were ok. Now I checked the fuses again and #37 has no power. It is the only fuse in the fuse box with no power. I doubt the wire came off underneath as it is the only one. Were should I look next?

Noahs944

Have you wiggled the headlight motor connector and wiring harness to the motor? That seems like the weak link to me.

marc abrams

Do you have power at the red/green wire (signal to go down) at the motor with key on, headlight switch off.
Fuse #37 is only hot when the headlights are on. That's for the signal to go up.

Roy Rabold

I only have power to the red/blue wire but not the red/green wire.

marc abrams

That red/green wire needs to be hot with the headlights switch in the off position. What year is your car?
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NS_Carguy

I doubt this is your issue , but i had a similar problem
What was happening to me was the headlight apparatus was getting caught on the hood release cable on the drivers side . it would jam and cause the fuse to blow .
a zip tie fixed my issue .
if you have been tinkering around in there check to make sure nothing is binding .
from the sounds of things this is not your problem but it costs nothing to check

catamount

I've had a similar issue but it was the windshield washer pump that had come loose. It was preventing the headlights from going down.

Jfrahm

Had one where if you touched the manual override **** they'd go down. The rotary contactor in the motor assembly that handled the Up or Down logic was dirty or worn out.

Roy Rabold

My car is a 1986. I have checked all the possible binding areas and they are all clear. I have also replaced the motor.

marc abrams

Check to see if you have power at connector "H", pin #23 at the central electrical box with the headlight switch in the off position, key on.

If no power, there's a break between pin #23 and the #16 fuse.

If there is power, there's a break between pin #23 and pin #3 of the headlight motor.

Let us know what you found.

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Nissanplaya

Mine do go up and down, but most of the time the lights won't go down right away, might take from 1 to 10 mins for them to go down.

CHD

Marc Abrams, I know this is an old thread, but I have the same issue. Lights go up but not down. What do you mean by "connector 'H'. pin #23' "? Thanks.

CHD

Did you ever find out what was causing this? I have the exact same situation and have replaced motor, switch and relay. Thanks.