[Unique427]

Switching from halogen to LED turn signals can introduce either a hyper-flash
or no flash/steady on condition with turn signals. The electro-mechanical
relays use load resistance from the halogens to switch on and off. LEDs
require only a fraction of power and hence produce very little load resistance.
You have (2) options here. Splice in a load resistor into each turn signal circuit
that mimics the halogen and fools the relay, or replace it with LED
compatible solid state relays. Option 2 is better and cheaper. Plus those
load resistors can get hot enough to melt plastic. You will need to replace
(2) relays. One for turn signals, the other for hazard lights. My relays
were (2) prong Tridon 552. Some of you may have (3) prong relays.
Superbrightleds.com offers a (3) prong LED compatible relay.
1) CEC Industries LED Compatible (2) Prong Relay # EF32SS-R ($18.39 / Amazon)

SPECIAL NOTE:
After switching to LED compatible relays, if you still experience a
no flash/steady on condition, the relay socket was reverse wired. Old
electro-mechanical relays are not polarity sensitive and hence the
technician who wired it did not care to check. No worries. Easily
corrected with a relay polarity adapter. The CEC Industries EF32SS-R
plugs into the adapter and together they plug into the relay socket.
(1) or both relays could be reverse wired so test individually.
This should solve any persisting issue after installing LED compatible relays.
1) United Pacific Relay Polarity Adapter # 90650A ($1.99 / Summit Racing)

ADDITIONAL NOTES:
If you leave only the front turn signal lights as halogen and convert the rear
brake and turn signal lights to LED, there's likely enough load resistance
in the circuit to trip the mechanical relays without changing them.

Also, best results are had by using LED's color matched to the lens.
Use amber LEDs for amber lens and red LED's for red lens.
White works for everything but the brightest most vibrant light
transmissions comes from color matching.

1) iBrightstar 1157 BAY15D LED – Amber #X001JCP9KP ($16.99 pair / Amazon)
2) IBrightstar 1157 BAY15D LED – Red #X001IPJ4EF ($16.99 pair / Amazon)

License Plate Lights:
This is for Lucas L467 License Plate Assembly and requires (2) LED bulbs.
1) Superbrightleds BA9S LED 5 SMD Tower 6100K # BA9S-CWHP5 ($3.95 / Superbrightleds.com )