[Healeys] Ballast resistor wiring question
rchaskell at earthlink.net
Thu Dec 26 09:33:54 MST 2019
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).
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
> 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
> <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
> 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
> > bulbs on my 100 (I have the reflector pods electrified and
> wired for
> > turn signals). In addition to the bulbs I also purchased, at
> > 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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