Complete Skar RP 20001 Amplifier Wiring Schematic Guide for Car Audio Installation

Connect the power terminals directly to a dedicated 120A fuse within 18 inches of the battery to prevent voltage drop under heavy load. Use 4 AWG oxygen-free copper cables for both ground and positive leads–any thinner gauge risks overheating at sustained output levels above 1500W RMS. Verify the remote turn-on wire links to a 12V ignition-switched source with no less than 500mA capacity; insufficient current will cause erratic power cycling.

Bridge the speaker outputs if driving a single voice coil subwoofer, but ensure the impedance does not drop below 2 ohms–doing so will trigger the amplifier’s thermal protection. For dual voice coil configurations, wire both coils in parallel (not series) to maintain stable 1-ohm operation, but expect reduced power delivery. Connect RCA inputs to head unit preamp outputs with shielded cables; avoid routing near power wires to eliminate alternator whine.

Measure DC offset at the amplifier’s outputs before final connection–values exceeding 100mV indicate faulty circuitry and demand immediate servicing. Secure all ground connections to a bare metal chassis point, not painted surfaces, to ensure proper noise rejection. Test with a 100Hz sine wave signal at half power for 30 minutes; monitor temperatures–anything above 70°C suggests inadequate ventilation or excessive load.

RP-2000 Mono Amplifier Connection Manual

Begin by securing the amplifier’s ground cable to a bare metal chassis point within 18 inches of the device. Use a 4 AWG or thicker copper wire, ensuring the surface is sanded free of paint, rust, or corrosion before tightening the ring terminal with an 8mm bolt. A poorly grounded connection will induce alternator whine, signal distortion, or erratic protection-mode activation.

Route the RCA signal cables from the head unit’s preamp outputs directly to the amplifier’s input terminals, avoiding parallel runs with power or speaker wires longer than 6 inches. If separation is unavoidable, cross at 90-degree angles and use twisted-pair RCAs to minimize electromagnetic interference. For dual-subwoofer setups, verify phase alignment by reversing one coil’s polarity temporarily–incorrect alignment cancels bass output.

Remote Turn-On and Power Distribution

Connect the remote turn-on lead (16–18 AWG) from the head unit’s dedicated wire to the amplifier’s trigger terminal, adding a 1kΩ resistor inline to prevent voltage spikes that may damage the onboard circuitry. Ensure the main power cable (4 AWG minimum) runs from the battery through a 120-amp fuse holder positioned no farther than 18 inches from the battery post, using tinned copper lugs crimped and soldered for peak conductivity.

For bridged operation, attach the subwoofer’s positive terminal to the amplifier’s left positive (+) terminal and the negative to the right negative (–) terminal, doubling the output voltage but halving the impedance tolerance–ensure the subwoofer’s impedance matches or exceeds the amplifier’s minimum rating (2Ω stable). Test configurations with a multimeter before finalizing connections to prevent overheating or clipping-induced damage.

Mount the amplifier horizontally on a rigid, non-conductive surface, allowing at least 2 inches of clearance around all sides for airflow. Avoid stacking components or placing the device on carpeted surfaces, which trap heat and accelerate thermal shutdown. Secure all connections with adhesive-lined heat shrink tubing to prevent vibration-induced loosening, and verify tightness every 1,000 miles of driving to maintain signal integrity and prevent intermittent failures.

Finding the Amplifier’s Input and Output Connections

Turn the unit upside down to reveal the rear panel–input terminals sit on the left, marked “RCA” for signal cables, with color-coded red (right) and white (left) rings. To the right, “+12V”, “GND”, and “REM” terminals handle power; use 16-18 AWG wire for secure, corrosion-free contact, stripping 0.25″ of insulation. Avoid twisting strands–solder or crimp with a butt connector to prevent voltage drop.

Output terminals flank the center: + (red) and – (black) for 4-ohm mono or 2-ohm stereo configurations. Tighten binding posts with a 5/16″ nut driver, ensuring 15-20 in-lbs torque–over-tightening cracks the ceramic insulator. High-current connections demand 4 AWG wire for 2-ohm loads; use 8 AWG for 4-ohm systems. Label each wire with heat-shrink tubing to trace faults later.

Step-by-Step Power Cable Installation for High-Performance Amplifiers

Select an 8-gauge or thicker power cable for the main run to handle current demand without voltage drop. Measure the distance from the battery to the amp location–add 10% extra length to account for routing obstacles. Avoid corners, sharp edges, or moving parts where the cable could chafe. Secure the cable every 12 inches with adhesive-lined clamps to prevent vibration damage. Use a fuse holder rated for 125A within 18 inches of the battery terminal; this protects the entire circuit from short circuits.

Key preparation steps before connecting:

• Disconnect the negative battery terminal to eliminate accidental shorts.
• Strip ½ inch of insulation from both ends of the power cable.
• Twist strands tightly to prevent fraying and ensure full contact.
• Crimp a copper lug onto one end using a hex crimp tool–not pliers.
• Heat-shrink tubing over the crimped joint prevents corrosion and stray strands.

Route the cable along the vehicle’s existing harness channels, never through the passenger compartment. At the firewall, use a rubber grommet to prevent cable damage from metal edges. Inside the engine bay, keep the cable away from exhaust manifolds, alternators, and ignition wiring–heat and electrical noise degrade performance. If crossing under the vehicle, secure the cable to the chassis with zip ties every 6 inches to prevent sagging or contact with road debris.

Final connections:

1. Attach the lugged end directly to the positive battery terminal, tightening to 12 ft-lbs torque.
2. Connect the other end to the amp’s power input marked “B+”–use a wrench to tighten the terminal nut securely.
3. Verify the ground cable is of equal gauge and attached to a bare metal chassis point within 3 feet of the amp.
4. Reconnect the negative battery terminal last, ensuring all connections are clean and free of oxidation.
5. Test system voltage at the amp’s power terminals–13.8V to 14.4V indicates proper charging.

For long-term reliability, inspect the power cable annually for abrasions, corrosion, or heat damage. Replace any compromised sections immediately–even minor resistance reduces output stability. Use a multimeter to check for voltage drop under load; readings above 0.2V between the battery and amp suggest poor conductivity. Avoid cheap copper-clad aluminum cables; they overheat under sustained high-current operation. Properly installed, this setup delivers consistent power without distortion or thermal throttling.

Ground Wire Installation: Proper Gauge and Secure Grounding Techniques

Use a minimum 4 AWG copper wire for amplifiers drawing up to 1,500W RMS, even if the manufacturer suggests a thinner gauge. Thicker wire reduces voltage drop, prevents overheating, and ensures stable current flow under peak loads. For systems exceeding 2,000W RMS, upgrade to 2 AWG or larger to maintain efficiency during bass-heavy signals.

• Measure the exact distance from the amplifier’s ground terminal to the chassis or battery ground point. Add 20% extra length to account for routing obstacles and secure fastening.
• Avoid daisy-chaining ground wires–each amplifier must connect directly to the same clean metal chassis point or a dedicated grounding block. Parallel paths create resistance imbalances and introduce noise.
• Strip 0.5 inches of insulation from the wire end, ensuring no frayed strands remain. Apply dielectric grease to the connection to prevent corrosion, especially in humid environments.

Choose a grounding location with bare metal contact–remove paint, rust, or coatings using a wire brush or sandpaper. The mounting surface must be flat, smooth, and free of oxidation to ensure a low-resistance bond. Secure the ground terminal with a stainless steel bolt and star washer, torqued to 10-12 ft-lbs to prevent loosening from vibrations.

For vehicles with aluminum frames, drill a 3/8-inch hole and install a threaded ground stud (M8 or 1/4-20) to create a reliable connection. Avoid relying on factory grounding points–they often lack sufficient conductivity for high-power setups. If the battery is in the trunk, run a separate ground cable from the engine bay to the chassis near the amplifier to equalize voltage potential.

1. Test ground integrity with a multimeter:
   • Set to 200Ω mode; probe between the amplifier’s ground terminal and the negative battery post.
   • Resistance should read less than 0.5Ω. Values above 1Ω indicate a poor connection–reclean and re-secure the ground.
   • Check for AC voltage leakage by probing between the ground terminal and chassis in 200mV AC mode. Readings above 50mV suggest alternator noise or improper grounding.

Twist ground and power cables together in a braided shield if routing near signal wires or ignition components. Maintain 6 inches of separation from RCA cables, and cross at 90-degree angles to minimize interference. Use adhesive-backed cable clamps every 18 inches to prevent movement and chafing against sharp edges.

In marine or off-road applications, apply marine-grade heat shrink tubing over the ground connection to seal against moisture. For installations in areas prone to water exposure, use tinned copper wire (resistant to corrosion) and waterproof terminal ends. Inspect ground connections every 6 months for oxidation or loose hardware–even minor degradation can cause clipping, overheating, or premature amplifier failure.

Never ground to:

• The vehicle’s ECU or sensitive electronics–stray currents can cause erratic behavior.
• Fuel lines, brake lines, or suspension components–vibration-induced shorts pose fire risks.
• Factory stereo ground points–these are sized for 50W head units, not high-current amplifiers.

Opt for a dedicated chassis bolt or a custom grounding plate welded to the frame for maximum reliability.