Old tractor hazard light knob / Warnblink-Knauf für alte Traktoren
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Pulling knob for the hazard lights switch e.g. on John Deere Lanz 710
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- Creative Commons — Public Domain
A friends old John Deere Lanz 710 recently had a broken knob for the hazard lights, so I built him a replacement. This tractor uses a dual circuit pull-switch from BOSCH for the hazard lights which is very common on old tractors, so the knob might fit on a whole bunch of others as well.
Instead of using the two springs inside to fix and contact the small ugly and outdated light bulb, I designed it to house a 5mm 12V led which does not any additional resistors (they're built in for 12V). You can find them e.g. on amazon, search for "WTN-5-12Vw" for the one I used.
The small star shaped piece centers and holds a piece of 1.6mm tig welding rod (copper coated standard steel material is best to solder the LEDs VCC pin to). The original round M5 nut thats vulcanized into the rubber is replaced by a standard M5 nut that has to be glued in place once the GND pin of the LED has bin soldered to the nut.
Assembly is a little tricky to get all the distances right and you've got one shot. Once all is assembled and pushed in, you'll surely not get it back out without damaging something. I'll probably build another one soon and add assembly pictures and description then.