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. From: Forward Look Mopar Discussion List <L-FORWARDLOOK@xxxxxxxxxxxxx> On Behalf Of Lou Vee
Sent: Monday, February 8, 2021 5:15 PM
To: L-FORWARDLOOK@xxxxxxxxxxxxx
Subject: Re: [FWDLK] 1958 Plymouth tip of the day 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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