I install a complete electrical system in my 33. 1) Fuse panel with complete wiring 2) LED rear tail /stop lights w/3rd brake light 3) LED front blinkers run / turn signal 4) LED flashers - e-flasher and turn signal flasher The lights on the rear work perfect with LED flasher The front LED blinkers work also with light switch off except, when I pull the light switch to the first position for park/running lights, the dash blinker indicater lights come on and when I activate either blinker the blinker works but the indicator light just dims and never goes completely off. So I bought some incandescent blinker assenblies and hook them up and everything works perfect. I just figure what could be going on with the led blinker assemblies. The only other think I haven't done is install LED load diode on each light, I'd do that if I was for sure it would fix my plrblem. Thanks in advance
These two pic might help you out ,working & to Study .. I have use this wiring a few time's With ""all Leds "", & 3 wire / terminal Led flasher , 3rd terminal is a ground On flasher. 2 plug Flasher If just Led's ""On Rear "" then wire as Pic shows, Condensed bulbs on front & Led rear , wire as pic shows Bottom pic is Gm switch With Running just "On " in Running light Position pre 69
I had to add resistors, even with the electronic (LED) flasher unit. The rear LED lights would work fine, but once the fronts were installed, the flasher wouldn't work with all four. I installed a different electronic flasher and had the same issue, so added the resistors and lights have worked fine since. Don't know if that's your problem, but thought I'd share my LED light story. Good luck!
It all depends on how the dash indicators are wired. Your 33 is what brand name? I say this as I have a 59 Olds with a strange way of grounding the indicators. What they did was to use the opposite front turn signal to ground the indicator showing the intended turn direction. What ended up happening was with a 3 prong flasher (for incandescent bulbs), the center prong is used to provide flashing 12v to the indicator. But most 3 prong flashers have the center prong active when the L prong (for the signals themselves) is inactive. With this, both indicators iluminate at the same time, because of difference between the center and the L prongs. Now in your case, it sounds similar. I would check the indicators and how they are wired.
They are six ohm, fifty watt resistors. I found them on Ebay. Added to the front, as it was easier to access the wiring and mount the resistors. Two resistors, one for right signal light circuit and one for the left light circuit.
The wiring harness is from "Hotrodwires" the flashers are two prongs. I replaced the e-flashers with a led replacement and they work perfect. I replaced the turn signal flasher with a two prong with a third ground wire and got them to flash, but I'm getting a crossfeed thru the led dash blinker indicator lights. I just got thru reading where if you replace your incandescent blinker indicators with leds you need to add a diode to the indicators to prevent a crossfeed. I have a set of incandescent blinker assemblies that I wired up and everything works perfect, so I assume wiring is correct.
I would also check to make sure you have good grounds on those lamp housings. LEDs do odd things that incandescent lamps don't because they will react to very low current.