[Healeys] Ballast resistor wiring question

[jim]

 Careful ...don't confuse OHMS with WATTS ...
R=E/I (resistance in ohms equals voltage divided by current)
P=IE  (power in watts equals current multiplied by volts


    On Thursday, December 26, 2019, 3:04:18 PM UTC, Michael Salter <michaelsalter at gmail.com> 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> 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> 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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