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The buzzer is a low current device and an 1N4003 (1amp/200volt) will do fine.

Well, the flasher never sees any load other than the relay coil, so it should not get exposed to any overload or short in the light circuit.

The buzzer may seem loud when engine is at idle, but on the road, with a headset/ear plugs on it's just right. Even okay with 4-way flashers going on some long uphill drive. Never forget to turn them off. The green indicator light is hopeless, in bright sunlight you can't see it and at night...

Jon, this is the easy method, only one diode and a couple of splices. Doesn't effect anything else, just adds the buzzer signal when your turn signals are on..

Ebay, of course, about $15/ea. Look for "aircraft relays". Surplusnut has 'em. Made by Cutler Hammer or Leach. BTW, they are rated 25 amps, hermetically sealed and are good for the full mil spec temp range. Suite the deuce to a T. :-)

Yeah, I like them big. A 25 amp mil spec relay can handle a 10 amp "lamp load" with inrush currents up to 100 amps...

The flasher unit on our trucks are prone to failure simply because the new ones are built with Radio Shack parts and appear to have no overload protection. The encapsulant hides all. I dissected several units for an article a few years ago and since this subject comes up so often I thought I'd...