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KL 6858
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HEAVY-DUTY AMPERAGE ELECTRICAL ARCHITECTURE FOR LONG-WHEELBASE RUNS
Establish a rock-solid, high-current power path across long-wheelbase vehicle setups with the premium Kleinn Model 6858 Extended Air Compressor Wiring Kit. Explicitly engineered to safely deliver clean power to heavy-draw automotive air systems over longer distances, this master electrical installation package features a massive length of premium 10-gauge structural copper infrastructure wiring. By minimizing voltage drops and eliminating electrical bottlenecks on long wire runs, this kit ensures your heavy-duty compressors start up immediately and run at peak performance without overheating your vehicle's factory electrical layers.
UNIVERSAL LONG-REACH HIGH-AMPERAGE POWER HARNESS
The Model 6858 is heavily curated with essential electrical baseline components to simplify your plumbing from bumper to bumper. Featuring a specialized 12V 30/40 amp 5-pin SPDT automotive relay and a dedicated pre-wired socket harness, this network safely separates your cabin controls from high-amperage current spikes under the hood. While optimally optimized as the official companion wiring array for Kleinn train horn systems, this versatile master installation kit can also be deployed in any custom 12V application where switching high-amperage auxiliary devices is required across extended frame rails.
THE VERDICT: The definitive long-reach electrical foundation for any high-output air network. The Model 6858 marries extended heavy-gauge current capabilities with a vital safety fuse and control relay, ensuring your onboard air installation remains secure, efficient, and completely fire-safe across large vehicles.
🔴 PRO TIP: Tailor your wire routing seamlessly to your chassis length. This extended 26-foot wiring bundle is custom-tailored to handle complex routes along frame rails. If your vehicle layout is more compact and does not require an extended long-reach line run, you can utilize our standard 14.75-foot power line setup by choosing Kleinn Part #6852 Wiring Kit.
PRODUCT SPECIFICATIONS
| Feature | Details |
|---|---|
| Part Number | 6858 |
| Wire Gauge Core Sizing | Heavy-Duty 10 AWG Power Line / 18 AWG Signal Line |
| Power Wire Length | 26.0 Feet Total Extended Run |
| Relay Specifications | 12-Volt DC / 30/40 Amp 5-Pin SPDT with Socket Harness |
| Circuit Protection Sizing | Inline ATC Fuseholder with 30-Amp ATC Fuse Included |
| Bonus Dash Control Switch | Model 320 (Brushed Nickel - 7/8" Face / Fits 3/4" Hole) |
| System Voltage Compatibility | Standard 12-Volt DC Automotive Electrical Loops |
| Universal Utility Applications | Long-Bed Trucks, Full-Size SUVs, Air Compressors, Train Horn Solenoids, Auxiliary Relays |
INSTALLATION LINKS

$114.95
Kleinn Automotive Accessories stands behind the quality and craftsmanship of our products. Our products are covered against defects in materials and workmanship when properly installed and used under normal operating conditions, subject to the terms below.
Unless otherwise specified, Kleinn Automotive Accessories products are covered by a 1-year limited warranty from the original date of purchase.
This warranty applies to the original purchaser and covers defects in materials and workmanship under normal use.
If a product is determined to have a covered warranty defect, Kleinn Automotive Accessories will, at its discretion, repair or replace the defective product or component.
This warranty does not cover damage or failure resulting from:
Kleinn Automotive Accessories is not responsible for installation or removal charges, diagnostic fees, labor costs, vehicle downtime, loss of use, or other incidental or consequential expenses associated with warranty service.
To request warranty service, email warranty@kleinn.com with the following information:
A Kleinn representative will review your claim and may first attempt to resolve the issue through technical support.
If the product needs to be returned for inspection, Kleinn will provide a Return Authorization (RA) number and return instructions. Products should not be returned without prior authorization.
Once received, the product will be inspected to determine whether the issue is covered under warranty. If a covered defect in materials or workmanship is confirmed, Kleinn will, at its discretion, repair or replace the defective product or component.
If inspection determines that the product does not have a covered warranty defect, the product may be returned to the customer, and the customer will be responsible for applicable return shipping costs.
This limited warranty gives you specific legal rights. You may also have other rights, which vary from state to state.
Your item must be in its original unused condition to be returned, unless there is a manufacturer defect. You must return the item within 30 days of your purchase.
1. Please email support@kleinn.com to request a refund and we will assign you a Return Authorization #.
2. Mail your returned item to:
Kleinn Automotive Accessories
Returns Department
4045 N Highway Drive
Tucson, AZ 85705
3. Include in your package a signed letter stating the reason for your return and the original receipt.
Merchandise that has been worn, used, or altered will not be accepted for return or exchange.
All returns are subject to a 15% restocking fee, which will be deducted from your refund. If shipping and handling fees were applied to your order, they are non-refundable.