Want brighter headlights in your 3rd Gen 4Runner?
Before you do anything.... Check your voltage drop! If you are loosing a volt or more you are better spending your money on a new
headlamp harness before you buy those fancy new bulbs. Actually with a new harness you will get the real benefits from those high-tech
bulbs without the risk of damaging your factory headlamp wiring and switch.
If your car is a little older and you want to improve the forward lighting check your voltages before you spend a dime. I did extensive
testing of my wife's 1998 Toyota 4Runner and was shocked. She was loosing up to 1.58 volts at her high beam and up to 1.33 volts on
her low beam. We installed a new harness and reduced the maximum voltage loss on high beam to 0.42 volts and low beam to 0.29
volts. The harness provided a 31-35% improvement in light (lumen) output. See data here.
The voltage difference (before harness and after harness) may not seem like a lot but light output is proportional to the 3.4 power of the
voltage, so (13.47/12.32)^3.4 is about 35% more light, for the same bulb!. Pretty good for $84.50 and an hour to install! (And you can
now run higher watt bulbs if you wish. See our bulbs for a full selection.)
It is important to do these tests under load (lights on, bulbs lit), engine running at 2,000 RPM and compare the voltage across the
headlight connector vs. the battery voltage. (CAUTION: You are working with your vehicle's lighting system. If you are not comfortable
with this testing, ask for help from someone familiar with these tests. If you are in the Denver, Colorado metro area we can test your
4Runner with our custom made tester and we can install the harness as well, just drop us an e-mail. Please inquire about other
vehicles.) Most sources say that if your headlight voltage is within 1 volt of the battery, you're fine. More than a 1 volt drop, you should
install a harness. If you are going to run higher than stock wattage bulbs, install a harness whatever your voltage drop might be.
The human eyes are not terribly sensitive to small increases in light output. For example, it is probably hard to detect a 20% light
increase. The increased light output you will see is often in the form of a more uniform light pattern (that is the dimmer areas are now
closer in brightness to the brighter areas) rather than the bright areas being brighter. The result is more usable light pattern (more light on
the road) for driving, which after all is the whole point of the headlights. We increased the output of my wife's 4Runner headlamps by over
30%. Wouldn’t you rather drive a vehicle with a 30% increase in light than one without?
We are offering the 4Runner Premium-Plus harness at special price of $75,00 plus shipping. The regular price is $84.50. Limited
quantities at this price. Keep in mind, this is not the "inexpensive" “yellow" harness from China, this is a real PREMIUM harness made
by me in Denver, Colorado. Check out the details:
Headlight Services Premium-Plus Harness (Ground Switched)
NOT FOR VEHICLES WITH DRLs (Daytime Running Lights)
No cutting of any wires required. This new harness if fully reversible should you want to remove it at any time in the future. The factory
switch will now control relays that require little power of the original factory wires saving your precious factory switch gear and undersized
wire. The headlamp electrical requirements are now handled by new heavy gauge wire and modern relays and connectors.
Heavy 12AWG wire for bulbs and power (made in USA)
Dual power supply with two fuses (redundant power feed)
High quality Bosch/Tyco diode relays (the diode prevents back EMF)
High temp “ceramic” bulb connectors
Home-run ground wires (no risky “local” grounding)
All wires crimped and soldered
HEADLIGHT SERVICES - 4Runner Wiring
1995-2002 Toyota 4Runner Premium Plus Harness
(NOT for DRL equiped vehicles)
Special price $75.00