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Halogen bulbs question.
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Ray White



Joined: 02 Dec 2014
Posts: 7141
Location: Derby
PostPosted: Sat Jun 14, 2025 6:24 pm    Post subject: Halogen bulbs question. Reply with quote
I am pretty sure this has not been asked before.

I am fitting twin filament Halogen headlamp bulbs but have been stumped by not knowing which filament operates dipped beam and which is the main beam.

The bayonet bulbs (and holder) have equal height posts so could go in either way round

I would prefer to know in advance if the longest filament is the main beam - as I suspect - or I will be kept in the dark....
(sorry). Embarassed
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alastairq



Joined: 14 Oct 2016
Posts: 2121
Location: East Yorkshire
PostPosted: Sat Jun 14, 2025 7:26 pm    Post subject: Reply with quote
Erm, suck it & see? {Not literally, of course...I would never recommend sucking bulbs, or live wires, or PP3 batteries.]
_________________
Dellow Mk2, 1951 built, reg 1952.
Fiat 126 BIS
Cannon special [1996 registered. Built in 1950's]
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Ford Pop chassis, Ashley 1172 bodyshell, in pieces.
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Ray White



Joined: 02 Dec 2014
Posts: 7141
Location: Derby
PostPosted: Sat Jun 14, 2025 7:43 pm    Post subject: Reply with quote
alastairq wrote:
Erm, suck it & see? {Not literally, of course...I would never recommend sucking bulbs, or live wires, or PP3 batteries.]


That is what I have done. I now have low and high beams pointing in the right direction.

Getting the rubber seal over the edge of the reflector and onto the bucket was a job requiring three hands... but I managed it with just two!

As the youth of today might say: "it's 'cos I is a legend, innit." Razz
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