It's a pain in the neck, but you could get around this problem by wiring in power transistors into the line to prevent any back current from flowing where you don't want it to go. Getting LED's that have these transistors already built in would be a better idea though so you don't have to cut up your wiring harness.
Nathan
Thassit! You are right, Lou. Left and right *are* wired together - through the running lights, although not the turn signal lights. But when the turn signal current crosses internally to the running light circuit (because the running light leds are also shared in LED 1157 with the turn signal leds), the flashing current passes to running lights on the other side. Well, I’ve learned something new today. The only way to get around this, is to come up with bulbs that don’t share LED elements between turn signals and running lights. Now I’ll watch the rest of that video and see how it works out. Don’t spoil the ending for me! Here is another video indicating that when power is applied to one terminal of an LED 1157 bulb, the OTHER terminal will EMIT power (which then goes back down the wiring harness toward the turn signal switch, headlight switch, etc). So if the car's wiring circuit/switching is not designed for that situation, who knows what can happen? Maybe the current is following a path in the switch that has two contacts connected that would normally be assumed to be dead when the switch is in the other position. https://www.youtube.com/watch?v=0_x8hhbYxSA
Here’s the diagram again below, Lou: Current from the flasher is agnostic with respect to left, or right; it just supplies current that is alternatingly on, or off. The directional decision comes when the current arrives at the turn signal switch. I can’t see how the flasher is implicated. It doesn’t matter if the impedence of a bulb is zero (because of a short), or infinite (because it’s open), or somewhere in between. In the absence of power, it won’t light up. In David’s case, they light up on both sides, because he is getting power on both sides. That’s a wiring issue; I suspect, in the turn signal switch. There’s the old rule of thumb that electrical weirdness is often caused by bad grounds/ground loops. I wonder if the electronic circuitry in the LEDs and/or flasher (in combination with a ground issue) is causing some sort of circuit to be completed thru bulbs on the other side because of lower resistance but is not present when al old filament bulb is in place. Would have to scrunitze the wiring diagram to see if there is some path the current could be taking to/thru the “wrong” bulb besides thru the turn signal switch. He says he changed the flasher, Fern. Regardless: No flasher change, no bulb change, would cause lights to flash on *both* sides at the same time, unless power was distributed to both sides at the same time; either because of crossed wires, or a defect in the turn signal switch. LED bulbs don't draw enough current to make the flasher work properly. There's likely a solid state flasher that would work with them. Cheers from Fern with 300 letter cars. ------ Original Message ------ Sent: 08/02/2021 3:01:38 PM Subject: Re: [FWDLK] 1958 Plymouth tip of the day OK. I suspect, though, you do have a problem with your turn signal switch. To summarize, you say in this thread: - LED lights bulbs don't work in all old cars. They don't work in my 58 fury. They light up ok but the turn signals are all screwed up.
- I changed the flasher too. When i turn the turn signal to one side all 4 come on and flash.
- No change in wiring there is only one turn signal indecater
From (3), I take it you mean it works when you flip the turn signal one way, but not the other? Just to point out, (1) and (2) are not related issues. Here’s a snippet from the 1958 Plymouth wiring diagram where I’ve highlighted the turn signal circuit: Power is derived from the ignition switch, which supplies the flasher – which supplies power to the turn signal switch, which distributes either to the left or the right bulbs (both front and back. The behavior of the taillights is modified by the actuation of the brake pedal, but that’s a different topic). But it does not distribute to both sets of bulbs. Unless, wires are crossed; but you say there is no change in wiring. Then it can only be that your turn signal switch is supplying current from the flasher to *both* sides, when it should only be supplying it to the right (or, left; you didn’t say which). And I’m guessing you meant to say, that the switch behaves correctly in the other position. But in any event, substituting LEDs for incandescents is not responsible for the behavior you are observing.
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