Head light problem

When you replace the #10 fuse, are the head light switch and the ignition switch in the off positions? With the head light switch off, the high/low beam switch in the high beam position, the ignition switch off, and the head light doors closed, does the #10 fuse blow when you turn on the head light switch & the ignition switch? Or does the fuse only blow when the head light doors are fully open?

Make sure that the head light door up limit switch is properly adjusted. Check the ground wires, wire connectors, and ground attach points for the head lights and the door motor. Check for broken, frayed, corroded, or pinched wires and connections.

What year is the car?

The car is a 72L. I have a feeling that there is a short inside the motor. If I depress either limit switch when the motor is opening or closing the headlights, the motor just slows down but doesnt stop. I have tried different limit switches but it didnt help.Is there a way to test the see through relay?

Your problem is likely the upper door limit switch is bad or not adjusted correctly.

The switch is a normally closed switch which means it opens the circuit (or cuts power) to the headlamp motor once it has reached the fully open position. If the switch has an internal short, the switch will never open and an over current situation will occur since power will still be applied to the motor yet it can no longer move since it has hit its travel limit.

An easy way to test this is to remove one of the wires from the upper limit switch. With the wire disconnected the headlights will go down but will not go back up. Try this simple test and let us know the results.

Take care, Scott

quote:

Is there a way to test the see through relay?

You can visually check this relay by watching the two contacts move between the stationary contacts as the head light switch is turned on and off. The only things that can go wrong with this relay are the contacts and the coil. If the coil goes bad, the relay simply won't work. If the contacts are failing, you will probably see arcing while they are under load and the clear relay case may have smoke stains on the inside.

As both Scott and I pointed out, check the up limit switch adjustment. This is the limit switch that if in front of the head light door torque tube. This needs to be adjusted when doing the quad head light install.

Have you verified that the fuse only blows when the high beams are turned on? If so, does the fuse blow at any position of the head light doors, or only at full open?

Another check is to disconnect both wires at the head light door motor. Using an ohm meter, check for continuity between either motor terminal and the motor case. If you get a reading, then the motor has a winding or wire that is shorting to the case.

Ok I meant the Headlight door relay. I disconnected the upper limit switch as Scott suggested and it doesnt seem to make any difference. I will check the continuity next.

Thanks guys. This forum is great. I found out that the installed motor was not correct for this car. Luckily I had an extra window motor. Everything seems to working great right now.
Thanks again