Ok... so I am working on getting my bulbs replaced with LED's. I have the codes for the proper bulbes and I have replaced the main brake light with LED.

I have a 96 Prelude S, listed as stock it's like this...
brake light: 3496
rear turn signal: 3497
backup light: 1156

I've replaced the 3496 with 1157 bulbs, they work fine. I replaced the 3497 bulb with a 1156A (amber) bulb, works fine.

Ok, so I bought some 1157 LED bulbs. Put em in and turn my lights on... nothing. Apply the brake and they work ok.

I've tried to compare the base of the 1157 LED bulb and the 1157 regular bulb, I can't see much of any diffrence. I assume it's making contact, but I'm not 100% sure. Does anyone have any suggestions on why the LED bulbs aren't working?

I have the whole bulb assembly that you put the bulbs into and then put into the tail light of the car, here. Suggestions?

 

1157's arent dual filament. the LED versions of the 1157 arent desgined for dual voltage use like a dual filament bulb is.

that's why when you step on the brake, they work... but dont work with just the parking lights on.

this is also why you shouldnt deviate between bulb numbers unless you're positive they're constructed identically or are authorised as interchangeable.

you need LED equivalents of your stock number bulbs so you get the dual voltage fuction back to run the parking lights.