Backup Lights
The reason why I mounted the backup lights on my rear axle is to protect them from general on and off road debris. The rear axle guards the light when rolling forward and the sway bar guards them when backing up.
The bulbs used are 100 watt aircraft landing lights. These lights are hooked to a relay, which is triggered by the reverse light lead. This lead is found in the trailer harness and is powered by the trailer power lead.
One main reason for the aircraft lights are they are known to be long lasting. My bulbs have lasted over 100K miles thus far without any major problems
These bulbs can be purchased at most local NAPA stores for about $15 to $18 bucks. NAPA# 4509
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