[Healeys] Ballast resistor wiring question
michael.oritt at gmail.com
Thu Dec 26 09:32:41 MST 2019
Thank you for the additional information and I hope this issue did not bear
too heavily upon your thinking during your Christmas celebration.
As I believe I said in my last message the LED bulbs that Moss sent me are
about 5/16" longer than a standard incandescent 1137 unit and while they
may work on later cars that have rounded lenses they will not fit under the
flat tail light lens of a 100.
I may not have been clear in my original posting but a number of years ago
I electrified the reflector pods on the rear deck and, using the conical
plastic lens from later cars, I transferred turn signal function to them.
(I also have a free-standing LED strip wired as a third brake light
discreetly mounted to my hardtop below the rear window which is very bright
In any case since the tail light performs only running and brake light
function I only need to find shorter LED bulbs that are compatible with the
stock lens and since there is no flasher function I will not need a
ballast. If and when I find an LED bulb that fits within the reflector pod
I will then deal with the ballast resistor issue. In the meantime I am
sending the LED bulbs and ballasts back to Moss for a refund, and will
suggest that they not sell them to fit 100's without mods to the lenses.
Many thanks to you as well as others who have posted suggestions on the
On Thu, Dec 26, 2019 at 10:03 AM Michael Salter <michaelsalter at gmail.com>
> 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
> 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.
> On Tue, Dec 24, 2019, 10:30 AM Michael Oritt, <michael.oritt at 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 <rchaskell at earthlink.net>
>>> 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.
>>> 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
>>> > resistor's being installed between the power and ground leads to each
>>> > fixture but it does not specify which power lead. My question is: do
>>> > connect the ground lead to the tail light power lead or the turn
>>> > 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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