need a part number for a diode.

hey guys, I need a diode that will work on 12V (14V to be safe) and that can handle 25W.

I'm working on my car, and I got a 25 watt bulb for the blinker. When the blinker is on, the signal to the bulb is +12V but when it's off, it's -12V. I'm trying to get both the blinker and the brakelight onto 1 filament, but if I don't put a diode on the blinker, the current from the brake will run back up the blinker source.

You need 1- 1 diodes serial the brake and blinker positive wire. I recommend to use schottky diodes for best results e.g MBR360 or 1N5822

the signal to the bulb is +12V but when it's off, it's -12V

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How do you manage to get that??? Do you a 24V car? ie, where do you get -12V from?

no, it's 12V. Not really sure how to decrribe it. It's positive when the signal is illuminated and it's negative/ground when the blinker is off. I would just pick up a regulat 12-15V diode, but most that I've seen handle between .5W and 1W. I'm powering a 25 watt bulb, so if I ran a diode like that on the seup, I would just burn the **** out of it.

Yes, i've also thinking about this measuring, but i mean this is 0V.