Headlight Upgrade - Sealed Beam to H4 Conversion

Difficulty 1/51–3 hrs$50–2501984-2001

Replace the factory H6054 sealed-beam 5x7 headlamps — fitted to every Cherokee XJ from 1984 through the last 2001 model, not only the early trucks — with H4 conversion housings (Truck-Lite 27270C or Hella 003177801) for vastly better light using replaceable bulbs.

The XJ ran the same dim H6054 sealed-beam rectangular lamp (5x7 inches) for its entire production run; there was never a factory switch to a composite housing with a replaceable bulb. Stock sealed beams produce roughly 20% of what a modern projector does. The standard fix: drop in 5x7 H4 housings — Hella E-code with 60/55W H4 bulbs has been the enthusiast pick for 25 years; Truck-Lite LED (27270C) is the modern equivalent for $200/pair and is DOT-legal.

No wiring mods strictly required — the factory connector adapts via included H4 pigtails. HOWEVER: the factory headlight wiring is undersized 18 AWG and routes B+ through the dash switch. If you upgrade to higher-wattage bulbs (80/100W H4) you MUST install a relay harness (Painless 30815 or similar) that feeds battery+ directly to relays triggered by the dash switch — otherwise you cook the switch and get dim output.

For owners who want a single-piece LED unit instead of a bulb-replaceable H4 housing, see the direct LED sealed-beam and full-housing options in the LED headlight upgrade guide — same H6054 mounting bucket, no wiring changes either way. For SOA (square optic axis) bulbs in H4 housings, aim properly — bad aim from a great bulb is worse than mediocre aim from a stock bulb. Use a wall 25 feet away at the proper height.

Steps

  1. Remove the trim ring around each headlight bucket (2-3 Phillips screws) — leave the adjustment screws at the top and side of the bucket alone, those set aim, not retention.
  2. Pull the sealed beam forward out of the bucket and unplug the factory 2-wire connector from the back.
  3. Plug in the H4 housing's included pigtail adapter, then seat the housing in the bucket and reinstall the trim ring.
  4. If you're staying at stock 60/55W H4 wattage (Hella E-code), no further wiring is required — the factory circuit handles the load fine.
  5. If you're stepping up to 80/100W H4 bulbs or the Truck-Lite LED housing's higher draw, install the relay harness now: relay-triggered power runs straight from the battery to each headlight, and the factory dash switch only triggers the relay coil instead of carrying full headlight current.
  6. Aim both housings before driving at night. Park 25 feet from a flat wall, mark the stock low-beam cutoff in daylight, then adjust the housing's vertical and horizontal screws to match. A correctly-aimed H4 housing beats a mis-aimed "better" bulb every time.

Why it works

Trade-offs

Tools required

Parts

PartVendorEst. price
Hella H4 E-code 7x6 conversion (pair)Hella~$90
Truck-Lite 27270C LED 7x6 (pair)Truck-Lite~$240
Painless headlight relay harnessPainless Performance~$80

Sources

Related

Written and maintained by an AZ wheeler and driveway wrencher. Always cross-reference your factory service manual — modifications affect vehicle safety and warranty. Work at your own risk.

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