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1984 Headlight question... by David Riedle
Started on: 09-09-2021 07:09 PM
Replies: 3 (76 views)
Last post by: fierofool on 09-22-2021 11:30 AM
David Riedle
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From: Perry, MI. USA
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Report this Post09-09-2021 07:09 PM Click Here to See the Profile for David RiedleSend a Private Message to David RiedleEdit/Delete MessageReply w/QuoteDirect Link to This Post
I have a 14,000 mile Indy that is having an odd headlight issue. I have rebuilt both motors due to the disintegration of the gear and bumpers in my passenger side motor.

I replaced the gears and bumpers in both motors with aluminum gears and delrin bumpers, and the motors work well.

The issue that I am having is that my passenger side headlight will sometimes not go up. Turning the manual knob 10 degrees always makes the headlight go up. What is strange is that the headlight won't go up when the car is in the garage. When I drive the car on the road for a mile, it usually will work, and if it won't go up when I am driving, it will usually go up if I try it immediately. The grounds seem tight, and when I replaced the gears, the motors were like new inside, with the exception of the gears and bumpers.

Could I have a relay issue?
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Dennis LaGrua
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Report this Post09-10-2021 05:47 PM Click Here to See the Profile for Dennis LaGruaClick Here to Email Dennis LaGruaSend a Private Message to Dennis LaGruaEdit/Delete MessageReply w/QuoteDirect Link to This Post
If the problem is confined to one motor then its likely the headlight relay or an internal motor problem. First check the relay. If OK, how are the brushes on the motor? Do they look solid or well worn? If they are well worn they may not always make a good connection to the motor armature.

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FIREBOX
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Report this Post09-21-2021 02:10 PM Click Here to See the Profile for FIREBOXClick Here to Email FIREBOXSend a Private Message to FIREBOXEdit/Delete MessageReply w/QuoteDirect Link to This Post
motor contact issue likely since turning motor shaft "slightly" starts it. Try just tapping the manual knob to get it running.
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fierofool
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Report this Post09-22-2021 11:30 AM Click Here to See the Profile for fierofoolClick Here to visit fierofool's HomePageClick Here to Email fierofoolSend a Private Message to fierofoolEdit/Delete MessageReply w/QuoteDirect Link to This Post
That would indicate that the limiter switch point set failed to open at the end of travel. The bump opens them, allowing the opposite set of points to close and power the motor in the opposite direction of last travel. Power is still being applied until the point set is opened. No power is applied to the opposite until the light switch is activated to complete the circuit for that direction of travel.

In the dash switch, there are two circuits. One closes when the switch is turned on. That powers one side of the motor relay to raise the headlight. Power continues to be applied to that circuit, but the point set for UP should open at the end of travel, hence the circuit is now OPEN.

At this point, the point set for the DOWN movement is closed, but there is no power applied to that circuit until the dash switch is turned OFF. That completes the circuit and at the same time disconnects power to the UP circuit. At the end of travel in the DOWN movement, that pointset opens. Anywhere between fully open and fully closed, both point sets in the limiter switch are closed. There's just one side that is energized, dependin upon the position of the dash switch.
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