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Toyota Headlight Wiring Upgrade
Posted by: Rusty_ on Friday, February 15, 2008 (22:31:12) (915 Reads) Article Rating: 4.85714285714
Headlight upgrade wiring diagram
The fuse between battery and relays for headlight upgrade
Drivers side top view of headlight plug
Top view of passenger headlight
Relay mounted against the inner guard
Relay mounted on inner guard zoom out
Seek News › DIY › Toyota Headlight Wiring Upgrade
Back to top Back to main Skip to menuPosted by: Rusty_ on Friday, February 15, 2008 (22:31:12) (915 Reads) Article Rating: 4.85714285714
Headlight upgrade wiring diagram
| Material and /or Parts | |
|---|---|
Approx Time: | 6 hours |
| 1. | 1 x relay and 1 x change over relay |
| 2. | 2 x relay holders |
| 3. | 20 meters of 4 to 6 mm quality automotive wire |
| 4. | 2 x H4 plugs |
| 5. | 1 good quality fuse holder |
| 6. | Various connectors |
| 7. | Good quality crimps and soldering iron |
| 8. | Crinckle tube and tape to sheild new wiring |
After a long time procrastinating about upgrading the headlight wiring, I came across a system that worked for me, and I have decided to share it with you. I make no claims to it except it does work for me and if you decide that you want to try it then the information provided here is with all faults if any.
I looked at various other ideas out there, that need diodes and resisters ect to be added, I even thought about going to one of these major 4wd shops and buying an upgrade loom.
The other thing I wanted was to have it set up, so if something did go wrong with it for some unfortunate reason, I could revert back to the original system without much effort.
This system results in a full upgrade of the headlights, allows the use of higher wattage globes, requires nothing to prevent relays from hanging on, and also allows the high beam indicator to work correctly.
Headlights off
No supply to either relay, resulting in no headlight operation
Headlights on, low beam selected
original headlight supply power normal relay. Current flows through relay, through low beam, through the normally closed contacts of the change over relay directly to earth.
Headlights on high beam selected
original headlight supply powers normal relay, original high beam neg switch triggers change over relay, current flows through relay, through high beam through the change over relay directly to earth. Current is also flowing through the low beam filament, through the original low beam wire to power up the high beam indicator.
Results so far
I upgraded the standard bulbs with a pair of Phillips ( Those ones that claim %50 extra low beam yadda yadda. From memory they are the highest legal ones.
I am very happy with the headlights on the vehicle, I don't know how I put up with the standard setup for as long as I did.
Problems to date
I had a relay stop working, it's one of those with the fuse in it. What happen was water got in it and it looks like it started to rust up.
Solution
Next time I won't use that style of relay and will get a normal relay without the fuse, because I feel it will be better sealed from the water.
a). Because of where it's mounted
b). By design
c). And there is no reason to have another fuse in the system because there is one already at the battery.
I looked at various other ideas out there, that need diodes and resisters ect to be added, I even thought about going to one of these major 4wd shops and buying an upgrade loom.
The other thing I wanted was to have it set up, so if something did go wrong with it for some unfortunate reason, I could revert back to the original system without much effort.
This system results in a full upgrade of the headlights, allows the use of higher wattage globes, requires nothing to prevent relays from hanging on, and also allows the high beam indicator to work correctly.
Headlights off
No supply to either relay, resulting in no headlight operation
Headlights on, low beam selected
original headlight supply power normal relay. Current flows through relay, through low beam, through the normally closed contacts of the change over relay directly to earth.
Headlights on high beam selected
original headlight supply powers normal relay, original high beam neg switch triggers change over relay, current flows through relay, through high beam through the change over relay directly to earth. Current is also flowing through the low beam filament, through the original low beam wire to power up the high beam indicator.
Results so far
I upgraded the standard bulbs with a pair of Phillips ( Those ones that claim %50 extra low beam yadda yadda. From memory they are the highest legal ones.
I am very happy with the headlights on the vehicle, I don't know how I put up with the standard setup for as long as I did.
Problems to date
I had a relay stop working, it's one of those with the fuse in it. What happen was water got in it and it looks like it started to rust up.
Solution
Next time I won't use that style of relay and will get a normal relay without the fuse, because I feel it will be better sealed from the water.
a). Because of where it's mounted
b). By design
c). And there is no reason to have another fuse in the system because there is one already at the battery.
The fuse between battery and relays for headlight upgrade
Drivers side top view of headlight plug
Top view of passenger headlight
Relay mounted against the inner guard
Relay mounted on inner guard zoom out