isthisusernameavailable

Looks like the headlight housing is made of PP-T20, which the ballast mounts onto. A quick search suggests ballpark heat deflection of PP-T20 is
maybe 68-75C (154.4F-167F), depending on source. Since the housing has to be able to withstand the heat of the ballast without deforming, guessing that temperature of the ballast
would not normally exceed 150F?

For those interested in answering the trivia question, according to eggsafety.org, the safe temperature for cooking a fried egg is 144-158F.

Now onto the real question:
What's your best guess as to max temperature the headlight ballast can reach with low-beams on?

Trying to determine a safe heat rating for a coating to protect an old ballast from water and further corrosion after grinding off rust from the cover, and chalky residue from the galvanized portion...
Any product suggestions for coating old ballasts?

Thanks

Billman250

There are small holes in the underbody fender liner. You can look through these holes and have a clear view of the ballast. With that, you could use an infrared device to measure the temp after a long night ride.

In case you are wondering about where water could enter the ballast, it is through the red and black wires, which are concealed by the silver braided cover. Silicone the grommet where the two wires pass through the grommet.

Discovered over 10 years ago…

isthisusernameavailable

Very helpful tips, thank you!

Hadn't considered the entry point along the wires of the igniter. Replacing the ballast seal, and trying to waterproof the seam between the ballast cover and its case would have missed this failure point.