Quadracerx, I have a 149 and although I installed one, I don't recall it originally having a fuse for the headlights.
You should go to, and familiarize yourself with the Technical Library on this forum, where you will be able to view and download for your 149, the operator manual, chassis service manual, tiller manual, wiring diagram, etc. You'll be able to answer a lot of your questions before you need to ask them.
Back to your headlights, most likely the lamps are burned out. They are a 4411 PAR 36 sealed beam are are readily available. There are also LED replacements for them.
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