# Which DIODE for 12V lighting circuit?

I am trying to stop power feedback on a 12volt car lighting circuit, actually the 2 indicators that feedback from one side of flasher unit. My question is what DIODE do I need for this, I have 1N4001's but I think the 1A rating won't work for long as 1 indicator bulb is 21watts which is 1.75A, so 2 would = 3.5A is this correct? Thanks!