Thread: Headlight upgrade for 90s 4wd

Something often overlooked is voltage drop to the headlights - if youve got access to a multi meter see if you can measure the voltage across the bulb itself. Did a Narva training session about 25 years ago when i worked in auto electrical, and they said the difference between 13.8v (charging voltage) down to 12.5v reduced light output 30% - 40%. Putting thirstier bulbs in just made the voltage drop worse, and often they throw the light wrong as well with the filament in the wrong place. As someone else said above a couple of relays wired in can make a decent improvement just solving this issue with 80s/90s jap cars and their super thin wires.