The Magna Headlamp FAQ:

[Elwyn]

Just a pointer about converting to Parabolic Headlamps - it is NOT as simple as a "plug-n-play" swap of std lamps for parras.

Std Magna lamps run a dual-filament H4 bulb in one reflector - so that section of the lamp is lit whether lights are on low-beam or high-beam.
Parabolic Headlamps have single filament bulbs in both sections of the light (H1 and H7).

There is a fairly simple wiring mod needed if you replace standard lamps with parra's - Search these Forums for details - but if you do not do the wiring mod you will NOT have lights changing from Low-beam to High-beam correctly........

[WytWun]

Just a pointer about converting to Parabolic Headlamps - it is NOT as simple as a "plug-n-play" swap of std lamps for parras.

Std Magna lamps run a dual-filament H4 bulb in one reflector - so that section of the lamp is lit whether lights are on low-beam or high-beam.
Parabolic Headlamps have single filament bulbs in both sections of the light (H1 and H7).

There is a fairly simple wiring mod needed if you replace standard lamps with parra's - Search these Forums for details - but if you do not do the wiring mod you will NOT have lights changing from Low-beam to High-beam correctly........

Which raises the reverse question... if the car came with parabolics (as my TJ2 AWD did) and better light is considered more desirable than cool looks, what's involved in retrofitting the standard headlights (apart from acquiring the lights and the indicators)?

Andy