A Ser3 with coils
Youve guessed it its the hi/lo beam indicator thing!!!
Custom designed for the Ser3 copied by later models.
About $80 for a newie.
You fitted bigger bulbs by any chance???
All the load for the lights is drawn thru the switch which eventually burns it,bigger bulbs speed it up.
See Drivesafe on here.He has an easy diy upgrade that will swap your headlights over to direct battery draw via relays.The new switch you need will only draw a "trigger" feed thru it so no longer will overheat.
D2s are the same,Ive fitted the combined headlight/drivinh light upgrade to mine.WOW
Goodluck
Andrew


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. The headlights would probably benefit from an aftermarket relay upgrade.
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