Does the flasher have an external ground wire, if not may be the problem.
CEC Industries EF32RL Electronic Turn Signal Flasher Relay, LED Compatible, 2 + Ground Wire Prongs,
on Amazon

Last edited by Rudi (8/28/2021 7:03 PM)

When you tested them, did you test them both as turn signals and as emergency flashers?  Also, LEDs are polar while incandescent bulbs are not.  If your socket is getting the turn signal power in reverse polarity, then the LEDs would not light up but normal incandescent bulbs would still work fine.  If the polarity is fine, even the old style flasher should light up the bulbs, they just won't pull enough juice to cause the old style flasher units to flash properly.

Last edited by Rufus68 (8/28/2021 11:44 PM)

Try changing the polarity of the 2 blades to the flasher from the car wire harness.

My electronic flasher that came with my tail lights didn’t work even with the additional ground wire.

Worked after switching the 2 wires.

LED’s are fussy little  buggers, polarity and voltage sensitive plus totally non tolerant of bad grounds. Plug and play is iffy at best,  I always like to bench check them before installation verifying that they match the installation.
I have a box full of flasher relays that I tried and ones I tried to modify to make them work. The one I specified solved my issues, let us know your results.
The  off shore LED manufacturers have dubious QC and don’t seem to be bound by industry standards as far as polarity is concerned.

Last edited by Rudi (8/29/2021 9:33 AM)

BobE wrote:

MS - the LED flashers (turn signal & hazard) used by Racer's Inc fuse panel I installed recently is a CF-13 and are available from Amazon.  I used LED (1157's) both front and rear from SuperBrightLEDs and haven't had any issues.  
I tried to post the LED wiring diagram to this post but couldn't, I'll send it to you via email.

I got the diagram.  Hopefully the flasher does the trick. These lights are supposed to just plug in and function.

sometimes the LED's require an additional load to work.  They don't sometimes create enough load for the flashers to work.  Some electronic places sell a external load to install in the circuit.

Rudi wrote:

retired65 wrote:

sometimes the LED's require an additional load to work.  They don't sometimes create enough load for the flashers to work.  Some electronic places sell a external load to install in the circuit.

 
Added resistor defeats the benefits of low current draw of LED’s, besides adding heat the resistance ends up being equal to incandescent bulbs.
It is a fix but IMO the wrong one.

I agree.  It is better to get an electronic flasher that works with low draw.
 

The flasher came yesterday but I have not had time to work on the car.
I have been busy trying to finish out my new game room.  Lots of stuff to hang on the walls yet.

Well, you do have to take time to smell the roses once you work at mounting stuff on the walls.   Next I have to remove over 100 items from the walls of my old garage and relocate them to the new building.

The 66 is ready to go, right now, with incandescent turn signals fully functional.  The LEDs will go in whenI get time to fool with it.

And, yeah, a repaint for the old three car garage is probably in the cards once all the Ford stuff has been pulled.  We were actually discussing porcelain tile for the floor a couple of days ago.  I can put in porcelain tile for about half what the epoxy floor in the new shop cost.  Since no floor jacks or jackstands will be used there, the tile should hold up just fine.

I guess I'm just lucky.  I used two incandescent 1157's, six LED 1157's, a couple of diodes, and a stock bi-metal flasher.  Turns and E-flashers work perfect and they are very bright and visible.  I told Josh what I did so he did his FB the same way...he was lucky too.

BB

I was reading down through here a I think Steve got a couple bad bulbs. IIRC if you have a burnt out front bulb, no load up front, the rear bulb will still cause the flasher to blink. I feel if you just change the front to LED and rear left incandescent a standard flasher should work.