Hi Randall,
Diodes and resistors are beyond me. I stated on the list years ago that when
training I was in hospital for the entire period of electrical science
training. Fortunately, in later years I always had an auto electrician on my
staff and bluffed my way through for 40 years.
Interesting stuff though, if you understand it. I have tried , I have all
the books. They could be in Chinese for what good they have been.
Adrian
----- Original Message -----
From: "Randall" <TR3driver@ca.rr.com>
To: <triumphs@autox.team.net>
Sent: Wednesday, June 03, 2015 6:49 AM
Subject: Re: [TR] alternator conversion in a tr3
>> It is a long story, (don't ask it hurts,) but in reality a
>> LED bulb will not
>> complete the charging circuit at low engine revs under 2000-
>> 2500rpm. Fact.
>
> An easy solution for that problem (sorry, Dixie) is to add a resistor in
> parallel with the lamp. The resistor is a good idea anyway
> (IMO) in case the bulb ever burns out (or fails to make contact). I had
> one on my TR3A with alternator conversion, simply soldered
> to the back of the bulb holder but sticking out a bit to keep the heat
> away from the plastic.
>
> Also, some alternators (the ones that can be used in a "one wire"
> configuration) will not exhibit the above problem.
>
> However, there is another potential problem with the ignition warning
> lamp; which is that it can see substantial reverse voltage.
> Not all LEDs can withstand that much reverse voltage without damage. So a
> series diode may also be required. The diode may also be
> needed if you have an electronic ignition that has it's own power feed,
> like an MSD 6A.
>
> There are also some TRs where the turn indicator lamp operates with both
> polarities (eg 69 TR6). They will also need some
> modification to use an LED for the indicator (in addition to the mods to
> use LEDs as turn signals).
>
> -- Randall
>
>
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