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The Moss catalog states 'You will need one [resistor] for each side of
the car,' so I don't think it matters where you put them, as long as
they are in parallel in the circuit. 50W resistors are pretty large, so
I wouldn't want them in the engine bay; in the boot near the lights
would be my preference.
Resistor ratings are typically given in the load the resistor can
withstand without letting the smoke out, not how much power it will
pull--since voltage of the circuit the resistor is to be installed in
often isn't known--but Moss isn't specific about this. The turn signal
circuits are separate--although Moss implies they can somehow bleed
through--so the power draw isn't additive*. The Moss catalog mentions
the 'application data in the schematic section of this catalog' but I'll
be damned if I can find said section and the search function on the
website yields no useful results; anybody know the page# in the current
catalog?
The catalog is confusing as it states you'll need an electronic flasher
if you install LEDs, then gives the option to install load resistors;
presumably, if you don't want to replace your old-school flasher.
Bob
* theoretically, since the flasher operates both sides of the signals
you could put a single resistor on the 'signal' terminal of the flasher
(IIRC, the flashers have GND, power and 'signal' terminals).
On 12/26/2019 7:05 AM, Michael Salter wrote:
> After due consideration I've come to realize that there is a problem
> with the planed resistor installation.
> The original Lucas "thermal " type flasher unit is rated at 42 watts.
> The resistors that are shown on the Moss web site are 50 watt.
> If you were to install such a resistor, to simulate the load, on each
> turn signal bulb the load through the flasher unit, when the signals
> were selected, would be 100 watts PLUS whatever the LED lamps drew.
> This would result in 8.3 amps flowing through the flasher unit ...
> probably enough to burn it out!!
> I would think that a far better solution would be to install two 50
> watt resistors.
> On the turn signal relay (that mysterious metal box mounted on the
> left front inner fender). One 50 watt resistor would be installed
> between terminal 2 and ground and the other between terminal 6 and ground.
> Those original flasher units are becoming VERY hard to find so it
> would be a pity to cook any more of them.
>
> M
>
>
> On Tue, Dec 24, 2019, 10:30 AM Michael Oritt, <michael.oritt@gmail.com
>
> Thanks all. What Kees says flies in the face of both Moss's
> (slightly inarticulate) instructions as well as the consensus of
> the group. I will install ONE resistor in the flasher lead of
> each lamp, two--not four--resistors total.
>
> Best--Michael Oritt
>
> On Tue, Dec 24, 2019 at 10:22 AM Bob Haskell
>
> Per the Moss video, you're creating a new ground path to
> prevent all
> lights blinking when you turn on the left or right turn
> signal. So
> connect the ballast resistors to the turn signal circuit.
>
> Cheers,
>
> Bob Haskell
> Austin Healey 3000 BN7/BT7 registrar
>
> On 12/24/19 9:22 AM, Michael Oritt wrote:
> > I purchased two of the Moss 170-941 red LED bulbs to use as
> > tail-lights/brake-lights to replace the standard 1157 dual
> filament
> > bulbs on my 100 (I have the reflector pods electrified and
> wired for
> > turn signals). In addition to the bulbs I also purchased,
> at Moss's
> > suggestion, two 170-965 Load Resistors.
> >
> > The instructions for installation of the resistors simply
> talk about the
> > resistor's being installed between the power and ground
> leads to each
> > fixture but it does not specify which power lead. My
> question is: Â do I
> > connect the ground lead to the tail light power lead or the
> turn signal
> > power lead or does it matter? I cannot envision connecting
> it to both
> > as that would defeat their separate function.
> >
> > TIA....Michael Oritt
> >
>
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The Moss catalog states 'You will need one [resistor] for each side
of the car,' so I don't think it matters where you put them, as long
as they are in parallel in the circuit. 50W resistors are pretty
large, so I wouldn't want them in the engine bay; in the boot near
the lights would be my preference.<br>
<br>
Resistor ratings are typically given in the load the resistor can
withstand without letting the smoke out, not how much power it will
pull--since voltage of the circuit the resistor is to be installed
in often isn't known--but Moss isn't specific about this. The turn
signal circuits are separate--although Moss implies they can somehow
bleed through--so the power draw isn't additive*. The Moss catalog
mentions the 'application data in the schematic section of this
catalog' but I'll be damned if I can find said section and the
search function on the website yields no useful results; anybody
know the page# in the current catalog?<br>
<br>
The catalog is confusing as it states you'll need an electronic
flasher if you install LEDs, then gives the option to install load
resistors; presumably, if you don't want to replace your old-school
flasher.<br>
<br>
Bob<br>
<br>
* theoretically, since the flasher operates both sides of the
signals you could put a single resistor on the 'signal' terminal of
the flasher (IIRC, the flashers have GND, power and 'signal'
terminals).<br>
<br>
<br>
<div class="moz-cite-prefix">On 12/26/2019 7:05 AM, Michael Salter
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAB3i7LLdKC_hVpfjUwgGJXom_9H6q6GXNki6Yg+GW=AsYMWKoA@mail.gmail.com">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<div dir="auto">
<div>After due consideration I've come to realize that there is
a problem with the planed resistor installation.Â
<div dir="auto">The original Lucas "thermal " type flasher
unit is rated at 42 watts. </div>
<div dir="auto">The resistors that are shown on the Moss web
site are 50 watt. </div>
<div dir="auto">If you were to install such a resistor, to
simulate the load, on each turn signal bulb the load through
the flasher unit, when the signals were selected, would be
100 watts PLUS whatever the LED lamps drew. This would
result in 8.3 amps flowing through the flasher unit ...
probably enough to burn it out!!</div>
<div dir="auto">I would think that a far better solution would
be to install two 50 watt resistors.</div>
<div dir="auto">On the turn signal relay (that mysterious
metal box mounted on the left front inner fender). One 50
watt resistor would be installed between terminal 2 and
ground and the other between terminal 6 and ground.</div>
<div dir="auto">Those original flasher units are becoming VERY
hard to find so it would be a pity to cook any more of them.</div>
<div dir="auto"><br>
</div>
<div dir="auto">M</div>
<br>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Tue, Dec 24, 2019,
10:30 AM Michael Oritt, <<a
href="mailto:michael.oritt@gmail.com"; rel="noreferrer
noreferrer" target="_blank"
moz-do-not-send="true">michael.oritt@gmail.com</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr">
<div class="gmail_default" style="color:#3333ff">Thanks
all. What Kees says flies in the face of both Moss's
(slightly inarticulate) instructions as well as the
consensus of the group. I will install ONE resistor
in the flasher lead of each lamp, two--not
four--resistors total.</div>
<div class="gmail_default" style="color:#3333ff"><br>
</div>
<div class="gmail_default" style="color:#3333ff">Best--Michael
Oritt</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Tue, Dec 24, 2019
at 10:22 AM Bob Haskell <<a
href="mailto:rchaskell@earthlink.net";
rel="noreferrer noreferrer noreferrer"
target="_blank"
moz-do-not-send="true">rchaskell@earthlink.net</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px
0px 0.8ex;border-left:1px solid
rgb(204,204,204);padding-left:1ex">Per the Moss video,
you're creating a new ground path to prevent all <br>
lights blinking when you turn on the left or right
turn signal. So <br>
connect the ballast resistors to the turn signal
circuit.<br>
<br>
Cheers,<br>
<br>
Bob Haskell<br>
Austin Healey 3000 BN7/BT7 registrar<br>
<br>
On 12/24/19 9:22 AM, Michael Oritt wrote:<br>
> I purchased two of the Moss 170-941 red LED bulbs
to use as <br>
> tail-lights/brake-lights to replace the standard
1157 dual filament <br>
> bulbs on my 100 (I have the reflector pods
electrified and wired for <br>
> turn signals). In addition to the bulbs I also
purchased, at Moss's <br>
> suggestion, two 170-965 Load Resistors.<br>
> <br>
> The instructions for installation of the
resistors simply talk about the <br>
> resistor's being installed between the power and
ground leads to each <br>
> fixture but it does not specify which power
lead. My question is:  do I <br>
> connect the ground lead to the tail light power
lead or the turn signal <br>
> power lead or does it matter? I cannot envision
connecting it to both <br>
> as that would defeat their separate function.<br>
> <br>
> TIA....Michael Oritt<br>
> </blockquote>
</div>
</blockquote>
</div>
</div>
</div>
</blockquote>
<br>
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