For future testing using digital multi-meter, recommend:
A - Confirm exact volt delivery of the little brown wire (on your specific sled). re: Is that brown wire delivering "DC" at 9V, 12 Volts or 13.8 Volts? This can be done using a Digital Multi-Meter on its DC 20 setting and using its frame ground. When testing, rev engine up/down to confirm if "volts" delivery remains constant. If your sled is steady at 10 volts, best to get LEDs with 9-14 volt ratings. If your sled is 12 volts and rises up to 13.8 volts (which is normal on many auto 12 volt systems), then get LEDs for 12-24 Volts ratings.
B - Confirm your LEDs "real" Amp usage. Remember that real Volts x real Amps = real Watts Usage (on your unique sled). And yes, each sled and each LED bulb is slightly different. To obtain "real" amps usage of your 2x20W LED bulbs, surf video at _https://www.youtube.com/watch?v=5xMDWzUPk_w (remember to remove the _ at beginning of this URL).
Tips: If your specific sled is steady at 11 volts (from item A), remember Volts delivery (real life) x Amp Usage (from meter) = Watts (real watts being used). For fuse and wire sizes, remember to "round up" to the next available size (with fuse being smaller size / compared to its wire thickness / for fuse to be its weakest melt point). And, remember that each sled's brown wire and each LED bulb(s) are different.
Hope this helps as well...