In a message dated 10/29/2010 4:52:18 PM Central Daylight Time,
levilevi@comcast.net writes:
> I bought some and installed them at VTR this year. I got the tail
> light/brake light combination 1157 equivalent LED bulbs. Found out
> that I can't turn on the tail light/headlight switch on the column of
> a 71 TR6 and use my cruise control at the same time. I've got a
> message into Jim Thompson at LiteZupp but don't think he's back from
> VTR yet so I haven't heard his diagnosis of this issue. I'm thinking
> it has something to do with the brake light portion of the LED bulb
> and the brake light switch since my cruise is hooked to the brake
> light switch and shuts off when the brake pedal is touched (just like
> a real modern car). I just don't know how it could be happening after
> looking at the wiring schematics in Dan Masters electrical maintenance
> handbook.
>
>
> The cruise works just fine as long as I don't turn the light switch
> (on the column on). If I try to use the taillights it shuts the
> cruise off just as if I had touched the brake pedal. Putting the LEDs
> in was the ONLY thing the changed so it has to be something going on
> in there that doesn't happened with regular 1157 bulbs. Both the
> cruise and the lights work just fine independently but not together.
>
> Any ideas other than going back to regular bulbs? I wanted the LEDs
> mostly as running lights on the highways but the cruise control is a
> higher priority driving lots of miles and I at least have better brake
> lights when in traffic and not using the cruise control. I'd still
> like both to work at the same time for night time, and rainy-cloudy
> weather occasions.
>
First of all, have you verified that the lights still work per normal?
Check to make sure the gound wires are still attached. If everything is still
A-OK then a 100 Ohm resistor in parallel with the brake lights should solve
the problem.
LED's behave differently than filament bulbs. The LED's are in a
series/parallel combination and the LED's will draw no current until the
threaashold
voltage is reached which coul be 9 - 10 volts. That high of a voltage can
trigger the cruise control shut-off function.
Besides, a guy your age shouldn't be driving at night, old fart.
Dave (old fart)
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