I think the problem with using an LED in the charge indicator (ignition) light
is that it is wired to sense an imbalance in the charging circuit which means
that the current could flow in either direction. If you look at the wiring
diagram you will see that the charge indicator light is not grounded, but that
one lead is connected directly to the hot (by design negative) side of the
charging circuit while the other is connected to the hot side of the battery.
when the generator is not charging the current flows from the battery to the
charging circuit and lights the lamp. When the engine is running and the
generator is operating the circuit is balanced and there is no flow in the
circuit. If there is a fault in the charging circuit that causes the generator
to overcharge it again unbalances the circuit in the reverse direction and
causes the charge indicator light to glow.
An LED is a diode which means the current is only allowed to flow in one
direction. Therefore it will either not work when the current flow is in the
wrong direction, or if the current limit is exceeded it may be destroyed.
Bill Lawrence
BN1 #554
________________________________
From: Healeys <healeys-bounces at autox.team.net> on behalf of Fred Wescoe
<fredwescoe at gmail.com>
Sent: Thursday, August 2, 2018 8:33:39 PM
To: simon.lachlan at alexarevel.plus.com
Cc: Healeys
Subject: Re: [Healeys] LED panel lights
Simon,
I have read the same thing about not using LED bulbs in the ignition and high
beam indicators. However, I did replace them in my 66 BJ8 and all seems well.
No problems at all. Very easy to see during the day and at night. The
instruments are also easier to see at night, not bight white but still easier
to see.
Fred
66
I followed that thread with interest as my blue Main Beam and green Indicator
were always pretty dim.
I decided to get some of those little bulbs if I could find them at a sensible
price.
I decided to hunt down the size and reference of the bulb holder and then seek
the appropriate LEDs.
The bulb holder is an E10. Over here at least one can buy 10 of the short flat
ones for ?12:95 inc P&P. The longer ones are a little more, but only pennies
really.
I only point this out as people have been mentioning prices approaching that
for one single bulb. Just to let you know??
Now, I?ve put the bulbs in and they make a noticeable difference to the Main
Beam and the Indicator. The instruments? Not sure until I go out at night?.they
were OK anyhow. (I do hate fossicking around behind the instruments. Always
worry that I?ll detach some vital wire or two.)
Question??haven?t I heard that LED bulbs aren?t suitable for the red Ignition
light? Why? Is there a way of making them work there?
Thanks,
Simon
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