Low and high beam function

[lenientism]

This put me in doubt about low and high beam alteration when someone told me that on 960 they can't go on all together. The lamps have three reflector, supposedly one headlamp, one high beam, and one foglamp.

The problem is on headlamp bulb which is ordinary H4. My understanding that the bulb has separate lumen separated by layer and supported by separate relay and fuse. So when when high beam is operated the low beam stays on. Someone advised me that it can go alternately, turning them on together will be heating bulb and power deficit.

Especially for stevie turbo or anybody please enlighten me.

thanks

[Steve_D]

In my experience it is more normal for the low beam to switch off when high comes on.
No doubt there will be applications somewhere where both are on but IMHO there would be very little to gain and, as you said, an increased power drain.

Steve

[lenientism]

Thanks steve

I'd observe more whether the low beam is automatically off when the high comes on. It's said the high beam controller works only when the low beam position is on.

[Mroad]

From my findings in rewiring an old Land Rover to newer standards the low beam is switched off when high beam is switched on.
The only time they may be on together is when using the headlamp flasher switch as that has seperate supply so it allows you flash the headlights even when all the lights are switched off.
Even with completely seperate lamps for dip and main where overheating won't be an issue (e.g. BMW) they don't come on together.

[Mr2Mike]

You should not run both filaments simultaneously in an H4 lamp, it will cause the lamp to overheat and fail prematurely.

[lenientism]

Yes the low beam is off when the high comes on by default. Problem fixed now. Thanks Mroad and Mike..