Jerbor Firewall Wiring Harness Cover for Peterbilt 359/379 — ABS gutter, direct-fit replacement

JERBOR Firewall Wiring Harness Cover for Peterbilt 359 and 379 is a heavy-duty ABS gutter designed to protect and organize the truck’s wire harness at the firewall.

Built as a direct-fit replacement for worn or missing harness gutters on classic Peterbilt 359 and 379 models, this JERBOR cover helps shield electrical cables from moisture, debris, and abrasion along the firewall area. Manufactured from impact-resistant ABS, the part is dimensioned to match OEM routing and attaches where the original gutter (often referenced by part number 16-07571) would sit. The result is a tidy wiring run that reduces chafing and exposure to elements without major modification.

How does this harness cover improve cable longevity?

The JERBOR gutter creates a physical barrier between the harness and external hazards, lowering the risk of insulation wear and connector damage. By keeping wires routed and secured, it prevents rubbing against sharp edges and reduces exposure to road grime and water. Properly installed, the cover contributes to more consistent signal and power delivery by limiting environmental stress.

• Shields wiring from dirt, salt, and standing water
• Stops direct contact with chassis edges that cause abrasion
• Guides and contains multiple cable runs for neat routing

Will the JERBOR cover fit my Peterbilt 359 or 379 without modification?

This gutter is designed to match the factory mounting points and profile used on many Peterbilt 359 and 379 firewalls, making it a direct-replacement option in most installations. If your truck retains the original mounting hardware or bracketry, installation typically requires minimal adjustment. For older rigs with corrosion or altered firewall surfaces, light fitting or fresh fasteners may be necessary.

• Made to align with OEM firewall routing on 359 and 379 models
• Often installs with existing clips or screws—no cutting required
• Minor trimming or new fasteners recommended for heavily modified trucks

What material and durability can I expect from this replacement gutter?

The cover is molded from high-strength ABS plastic chosen for impact resistance and weather tolerance. ABS resists cracking from vibration and temperature swings common in heavy-duty applications. While durable, it is not metal; treat accordingly around extreme heat sources and inspect periodically for stress in high-vibration environments.

• Constructed from tough ABS for impact and flex resistance
• Designed to withstand road vibration and seasonal temperature changes
• Not intended for continuous exposure to direct engine heat or flames

How will this part arrive and what support is available if I need help?

The product ships as a single wiring harness gutter intended to replace the OE-installed piece. JERBOR includes one cover per package and provides customer support for fitment or installation questions. If you run into problems, their support team is available to assist with troubleshooting or replacement concerns.

• Supplied as 1 piece — ready to mount or swap into place
• Customer service available for fitment or product issues
• Sold as an aftermarket replacement compatible with part references like 16-07571

Who is this for? This JERBOR firewall wiring harness cover is aimed at truck owners, mechanics, and restoration shops working on Peterbilt 359 and 379 models who need a reliable, OEM-style gutter to protect electrical harnesses. It suits drivers maintaining vintage rigs, fleets replacing damaged firewall components, and anyone seeking a straightforward, durable replacement that restores proper cable routing and protection.