[Healeys] Ballast resistor wiring question

[Bob Haskell]

50 watts is the maximum power that the device will take.

If you have a simple circuit with just the battery and ballast resistor: 
12 volt and 6 ohms resistance, the current is 2 amps (I = V / R).  Power 
consumed would be 24 watts (P = IV).

Cheers,

Bob Haskell
Austin Healey 3000 BN7/BT7 registrar

On 12/26/19 10:05 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 at gmail.com 
> <mailto:michael.oritt at gmail.com>> wrote:
> 
>     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 <mailto:rchaskell at earthlink.net>> wrote:
> 
>         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:  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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