HEADLAMP WIRING DIGRAM

 
1. Right Headlamp (Type = 9004) 5. Fuse Box
2. Dimmer Switch 6. Main Fuse
3. Passing Switch 7. Battery
4. Light Switch 8. Left Headlamp
 
Each lamp has its own 10amp fuse (to the center post of each plug)  Only the High/Low beam Negative side is switched to  activate them.  The headlights total power is from a 30amp fuseable link, right from B+.

9007 type bulbs do not work with this plug configuration, even though the plugs are the same, they are switched differenty. If you want more Low/High beam wattage, a better 9004 bulb can be found with higher ratings.  OEM if 45Watt low, and 65Watt high.  There are replacement 9004 bulbs with 55/75 ratings, and higher.

There are now five or more different 9004 bulbs avaialble:
OEM (Yellowish tone), Crystal Blue (Whitish/Green), All Weather, Hyper (HIB) White, and the Blue Vision.

OEM bulbs vary in wattage with MFG.