Randall is correct, the primary difference in an otherwise stock TR2-4a is that
an alternator will probably put out more power at idle than a dynamo. But this
is not necessarily an advantage. Since power draw can vary a lot, the
alternator load at idle will vary as well. This makes idle RPM more variable
With a dynamo, at idle it has minimal output and therefore minimal additional
load at idle. If an alternator does not add any significant load at idle then
it is also not supplying much power at idle, and is not an advantage over a
dynamo
The approximately 5.5 amps reduction in power usage with LED headlights may not
sound like much, but it is 25% of the full output of the C40 dynamo. So this
is a significant reduction. I would also use LED tail lights to get another
few watts of reduction. Then you will have ample power from a dynamo.
Regarding H4 LED replacements, I am not enthusiastic about those that require
active cooling with a fan. Those little fans fail all the time. If the fan
fails, then the LEDs will fry. There are other designs which use passive
cooling with braided copper cable heatsinks. In testing, those seem to be
holding up to the demands of cooling inside sealed headlight buckets.
Here are the LEDs. Http://goo.gl/LMdLHU
-Tony
On Apr 11, 2015, at 2:00 PM, triumphs-request@autox.team.net wrote:
> Message: 2
> Date: Fri, 10 Apr 2015 14:22:10 -0700
> From: "Randall" <TR3driver@ca.rr.com>
> To: <terryrs@comcast.net>, <triumphs@autox.team.net>
> Subject: Re: [TR] Randall's Headlight Conversion
> Message-ID: <55.AD.19845.10F38255@cdptpa-oedge02>
> Content-Type: text/plain; charset="us-ascii"
>
>> One question I forgot to ask. Since the conversion is from
>> either incandescent or Halogen bulbs, to LED's, does this
>> mean the alternator conversion is no longer necessary? Would
>> the generator be able to keep up when headlights are not such
>> a draw on power in cold weather night driving?
>
> Should be OK, as long as you don't sit in traffic for very long or make a lot
> of short trips. The LEDs will certainly reduce the
> need for an alternator.
>
> -- Randall
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