I never really adjust this, I have it set to kind of barely on. I tried a 10 watt 5 ohm resistor and it set the brightness how I like it. Any problem with just replacing the dimmer with that?
Here's the magic smoke escaping. Strange that it bench tested OK, 3 -38 ohms or so.
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I have some of that left over from my Triumph TR250. 
Yes, a fixed resister is okay.
Make sure it is rated for the load and confirm it doesn’t get too hot in steady use.
Larry
you don't need a resistor at all....! But a wild guess, total load thru the bulbs may be 20watts, meaning ~2amps, and all pretty close to the resistor rating. Satisfy yourself that the resistor is not really, really hot ---if you can dare to keep your finger on it, its not too hot.
