Resistor in OD circuit

Jim Kilday
Jim Kilday Expert Adviser
edited November -1 in HUDSON
I have installed a Pertronix Ignitor in my '46 Hudson but need to put a 7 ohm, 5 watt resistor in the coil to OD switch circuit . Does anyone know where I might find one?



Thanks,



Jim Kilday

Comments

  • Park_W
    Park_W Senior Contributor
    Jim, try http://www.partsexpress.com. Their catalog shows a 7.5 ohm, 5 watt wire-wound resistor that should do the job. To insulate the bare leads, use shrink tubing or a piece of insulation stripped from a length of solid-conductor wire. The resistor can "hang in the air" or you can find or make a little bracket to clamp it the the firewall, etc.
  • Jim Kilday
    Jim Kilday Expert Adviser
    Park--



    Thanks, but I found a 7 ohm 5 watt at-- http://www.newark.com/65K1838/passives/product.us0?sku=vishay-dale-rh0057r000fe02&_requestid=15446



    Just as I hit the send button to order three of these little buggers, Pertronix with whom I had left several messages, called and referred me to the same company.



    Jim
  • [Deleted User]
    [Deleted User]
    May I ask the purpose of this resistor?



    The reason I am asking is that I have a pertronix unit in my Super Wasp, and did not hook up the OD kickdown point grounding lead for fear of damaging the pertronix unit if directly grounded.



    Thanks

    Mark
  • mars55
    mars55 Senior Contributor
    `Hudsonator wrote:
    May I ask the purpose of this resistor?



    The reason I am asking is that I have a pertronix unit in my Super Wasp, and did not hook up the OD kickdown point grounding lead for fear of damaging the pertronix unit if directly grounded.



    Thanks

    Mark





    The purpose of the 7 ohm resistor is prevent damage to the pertronix unit when a momentary ground is applied to coil when kicking out the overdrive. The point system could handle this short but not the solid states devices in the pertronix unit.
  • [Deleted User]
    [Deleted User]
    Thanks for the info. I hadn't hooked my OD kickdown up to the coil for just the reasons mentioned. We suspected a direct ground would do some damage to the Pertronix unit.



    I was going to use one of Park's new 6 volt relays in the NC position, then break it with the ground to momentarily "disconnect" the ignition. That way the points, or pertronix unit, would never be subject to a direct ground of any kind.



    Mark
  • Jim Kilday
    Jim Kilday Expert Adviser
    Looks like I missed all the fun. Been gone fly-fishing and the fishing was good!



    Hudsonator--what new relays are you referring to?



    jim
  • Park_W
    Park_W Senior Contributor
    If you found that wiring the Pertronix as Walt suggests works OK (power going first through the coil, then to the Pert unit), you could connect the "shorting wire" to the power supply side of the Pertronix (or the "non-power" side of the coil). Then you're essentially removing power from the Pertronix, not shorting it out.
  • [Deleted User]
    [Deleted User]
    Jim Kilday wrote:
    Hudsonator--what new relays are you referring to?



    jim



    Park had found some small, 6 volt, high amperage relays that were capable of handling the OD solenoid. These would handle several circuits in our cars, from the headlights to replacing the OD relay.



    I was told they might be offered throught the HET store, but I've never seen them listed and Park hasn't disclosed the source. I was told they would work either in normally open or normally closed positions. So, I was holding out to put one of these in the kickdown circuit as I mentioned before to "disconnect" the Pertronix and never subject it to a direct short.



    Mark
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