LED's and Cruise Control

Jul 28, 2018 4:50 PM - 436 Views Create A New Thread

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Bloomingdale, IL

Cruise not working
After a friend told me my '48 Ford's brake lights were hard to see, I replaced the 1157 bulbs with taillight lenses that have 40 LED's embedded in each lens and plug into the 1157 socket. I've got really bright tail and brake lights now,but the cruise stopped working. I've Googled the issue and found that I probably need to install a resistor so the cruise is fooled into thinking the old 1157 bulbs are there. Has anyone tried this and does it work? The car has a Rostra Ultra Cruise II.


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  • SAM1951
    Sep 3, 2018 at 8:09 PM

  • yes the resistor works. have them on several cars with that same cruise control
    they dont for some reason want to ok the resistors.
    they say use relay which works too

  • jimmothershead
    Jul 30, 2018 at 7:10 AM

  • Yep, like Jeff sez, you need a load for the cruize module to sense and drop out of cruize control

  • tazhog54
    Jul 29, 2018 at 7:59 PM

  • makes sense as there are no amps pulling on the led lights to click the relay s in releasing the cruise control Just like when you put in the led's the turn signal will not flash with regular flasher need to use the electronic model

  • lofat46
    Jul 29, 2018 at 7:50 PM

  • Thanks for the responses.

  • Bill33
    Jul 29, 2018 at 1:38 PM

  • Yes, I've just put cruise in my '37 and there is a note in the instructions about using LED brake lights. I'll look it up later, but it said you would have to install a relay. Here's a note out of the Dakota Digital CRS 3000 instruction manual: Please Note: If you are using L.E.D. taillights please wire a relay as shown here to allow for proper Cruise
    Control operation. Use Dakota Digital RLY-1, or any 5 pin SPDT normally open relay.
    When using the relay, the Violet must go to Pin 30 (RLY-1 Black) ONLY.
    Pin 86 (RLY-1 Red) is the only wire that now goes to the cold side of the brake switch

  • crdnblu
    Jul 29, 2018 at 9:57 AM

  • I suggest that you contact the manufacturer; they seem to support their products:


  • will547
    Jul 28, 2018 at 5:00 PM

  • I have never heard of that. But I am sure Google has the answer.

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