[TR] alternator conversion in a tr3

[Dixie4]

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 at ca.rr.com>
To: <triumphs at 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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