Headlight Comes up and Down non stop

[nguada]

I recently got a 1980 TR7, I am trying to fix the left headlight, it was not coming up, after fixing the circuit that feeds the Relay, now the headlight comes up and down non stop every time I turn on the lights.

Any Idea What should I do next?

[TR Tony]

Faulty limit switch I would guess. This is the flat switch attached to the headlamp motor on each side - it should break the circuit when the headlamp reaches the up position, thus stopping the headlamp pod in the correct position. It has the same operation when closing the headlamps. The headlamp motor only moves in one direction, making a cycle of 360 degrees, the limit switch stops the motor in the correct place during the up/down cycle.

These switches do get corroded over time. Might be worth taking the cover off & cleaning the contacts inside to see if it fixes the problem. Take care to seal it again, as it is exposed to water & general cr*p off the road.

If this doesn't fix it, Robsport are selling new (reconditioned) limit switch/motor assemblies at the moment. You might find a new limit switch on it's own but they are not easily available.

Tony

<font size="1">1981 2L FHC Cavalry Blue
1980 3.5L V8 DHC Jaguar Regency Red</font id="size1">

[nguada]

Thanks Tony, I will give it a try.

[bmcecosse]

The headlamp mechanism needs to be adjusted so it hits the 'stops' at the same time as the switch operates. If the stop is not there - the motor can run through the stopping position - even though there is supposedly 'dynamic braking' on the motor at that point. ie -The motor windings are short circuited - but only if the contact switch and/or relay is working as it should.