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davidcheshire · Jan 4th, 2018, 18:30

My 1984 GLT is negative earth, with one exception - at least the only one I've found so far.

The contacts in the front 21/5W bulb sockets register negative earth feed for the sidelight filament, but positive earth feed for the DRL filament.

Any ideas why this should be, and how to change both current supply contacts to negative earth?

Filament bulbs work as they should, but LEDs do not because they are not made with dual polarity, as far as I have learnt so far.

I'm hoping to replace the front DRL bulbs with LEDs for extra brightness, but no luck so far.

The rear stop and tail bulbs have been changed to LEDs without problem.

Jan 4th, 2018, 18:30	#1
davidcheshire VOC Member Last Online: Mar 25th, 2024 12:04 Join Date: Aug 2007 Location: aberdeen	Front day running lights conundrum My 1984 GLT is negative earth, with one exception - at least the only one I've found so far. The contacts in the front 21/5W bulb sockets register negative earth feed for the sidelight filament, but positive earth feed for the DRL filament. Any ideas why this should be, and how to change both current supply contacts to negative earth? Filament bulbs work as they should, but LEDs do not because they are not made with dual polarity, as far as I have learnt so far. I'm hoping to replace the front DRL bulbs with LEDs for extra brightness, but no luck so far. The rear stop and tail bulbs have been changed to LEDs without problem.