How to Install a Train Horn on a Jeep Gladiator (2020–2026)
Train horn install for Jeep Gladiator JT — Wrangler-derived chassis with mid-size pickup bed, spare tire location, underbody mounting, OEM horn fuse-tap wiring.
The Jeep Gladiator (JT platform) is the mid-size pickup version of the Wrangler JL — same body-on-frame chassis architecture, same Pentastar V6 / EcoDiesel powertrains, but with a 5-foot bed instead of a hardtop or fabric soft-top. The Gladiator launched in 2020 and shares mechanical parts with the JL.
For train horn installs, the Gladiator combines aspects of the Wrangler underbody approach with a more accessible bed-side frame for tank mounting. This page is a delta from the Wrangler JL install guide.
- Difficulty
- Moderate
- Underbody work + drilling
- Time
- 4–5 hours
- Universal underbody bracket
- Cost
- $1,200–$5,000
- Kit + bracket + parts
- Best mount
- Underbody chassis or bed
- Spare tire is rear-mounted
- Variants
- Sport, Rubicon, Mojave
- Plus EcoDiesel, Pentastar V6
- Air system
- 5-gal tank fits
- In-bed mount or underbody
What’s different from the Wrangler JL
- Has a usable bed. Unlike the JL hardtop, the Gladiator’s pickup bed gives you a clean overhead-accessible mounting envelope. A 5-gallon tank can mount inside a lockable bed toolbox; trumpets go underbody.
- Spare tire under the bed. The Gladiator’s full-size spare hangs underneath the bed area on a winch, similar to a Silverado or F-150 — different from the JL where the spare is on the rear tailgate. You can do a spare-tire-delete install on a Gladiator.
- Frame is similar but longer. The Gladiator’s wheelbase is significantly longer than the Wrangler JL’s, giving more underbody mount space along the frame rails.
- Same OEM horn fuse architecture as JL. MICRO2 add-a-circuit fuse-tap procedure is identical.
Mounting options
- Spare-tire-delete bracket. Same general approach as the F-150 install guide. Universal STL brackets fit the Gladiator with adaptation.
- In-bed toolbox mount. Tank in a lockable bed toolbox; compressor + trumpets underbody. Most accessible for service.
- Underbody chassis along the frame rail similar to the Wrangler JL approach.
Recommended kits
- HornBlasters Conductor’s Special 228H — $649.99–$749.99. Fits comfortably in the spare tire envelope.
- HornBlasters Shocker XL Kit — $1,800–$2,200. 5-gallon kit fits with adaptation.
- HornBlasters Nathan AirChime K5LA Kit — $4,999.99–$5,199.99. Real locomotive horn at the 149.4 dB ceiling.
Step-by-step
Same procedure as the F-150 install guide for spare-tire-delete, or the Wrangler JL install guide for underbody chassis mounting. MICRO2 fuse-tap to the OEM horn — see /install/by-task/wiring-diagram/.
Common Gladiator-specific problems
- Bracket fitment is still maturing. The Gladiator launched in 2020; aftermarket-specific brackets are limited. Most installers use universal STL brackets with adaptation.
- Rubicon trim front skid plate can interfere with engine-bay-side installs. Verify clearance.
- EcoDiesel exhaust routing runs warmer than the Pentastar; heat-shield the compressor near the spare tire location.
- Trail vibration loosens NPT fittings; thread-lock everything and recheck after first off-road outing.
- OEM horn fuse-tap issues identical to the JL.
Legal reminder
A train horn install on a Gladiator is legal in most U.S. states for the horn hardware itself, but using it on a public road typically violates state vehicle codes. Off-road use is broadly unrestricted. See /legal/ and /tools/state-legality/.
Sources
- Wrangler JL install guide (this site) (shared chassis architecture, OEM horn fuse-tap method)
- HornBlasters — Wrango JLU bracket (closest-platform underbody bracket; Gladiator is wheelbase-extended JL)
- HornBlasters — Goliath Mount product family (universal STL bracket geometry applicable to Gladiator with adaptation)
We do not perform hands-on installs. Verify all wiring against your specific Gladiator year and engine option’s service manual before powering up.