Add all of the bulb wattage for the full time on bulbs, headlight, taillight, instrument lights, etc.
Add all the bulb wattage for the part time bulbs, brake, turn, turn indicators, etc. and divide by 4 (25%)
Add these together and subtract from 135, this is the total reserve wattage you have to work with.
Why 135 when the system is rated at 170? You need enough left over to charge the battery and keep it charged, @20% of total available.
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