Newmar 150-A Alternator Filter
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Newmar 150-A Alternator Filter Product Description
Tired of Static and Hash Ruining Your Onboard Electronics?
Picture this: you're out on the water or cruising in your RV, flipping on the radio for some tunes or checking your fishfinder, only to be bombarded by crackling static, popping sounds, or snowy video screens. That's the infamous alternator whine—or more technically, electromagnetic interference (EMI) and radio frequency interference (RFI)—generated by your alternator, ignition, or motors. These pesky noises travel through power lines, turning your high-tech gear into a headache.
The Newmar 150-A steps in as your reliable fix. Designed specifically for high-current alternator outputs, this filter clamps down on noise across a broad spectrum from 70 kHz to 100 MHz, restoring crystal-clear audio and sharp visuals without compromising power delivery. Boat owners, RV enthusiasts, and truckers swear by it for silencing chaos in demanding 12V or 24V systems.
Why Choose the Newmar 150-A for Your Setup?
- Rugged Build for Harsh Environments: Machined aluminum housing shrugs off corrosion, vibration, and extreme temps—perfect for marine salt spray or dusty off-road trails.
- High-Capacity Handling: Rated at 150 amps continuous, it tackles beefy alternators (think 100A+ outputs) without breaking a sweat.
- Universal Voltage Fit: Works seamlessly from 6V to 48V DC, covering everything from small outboards to big diesel generators.
- Easy Bolt-On Install: Built-in flanges let you mount it right on the alternator or bulkhead; brass studs accept heavy-gauge cables for rock-solid connections.
- Proven Noise Suppression: Targets conducted noise at the source, outperforming generic ferrites that often fall short on high-power apps.
Unlike inline wire filters, the 150-A is optimized for alternator leads, making it the go-to for eliminating whine that plagues VHF radios, stereos, radars, and chartplotters.
Model Specs at a Glance
Here's how the 150-A stacks up against Newmar's smaller PC-series filters—ideal for tailoring suppression to your needs.
| Model | Current Rating | Installation Location | Height | Width | Depth | Weight |
|---|---|---|---|---|---|---|
| 150-A | 150 Amp | Alternator output lead | 3.25" (8.2 cm) | 5.75" (14.6 cm) | 3.25" (8.2 cm) | 3 lbs (1.4 kg) |
| PC-10 | 10 Amp | + and - power leads near equipment | 1.25" (3.2 cm) | 4.25" (10.8 cm) | 3" (7.6 cm) | 1 lb (0.5 kg) |
| PC-25 | 25 Amp | Same as PC-10 | 2" (5.1 cm) | 4.25" (10.8 cm) | 3.25" (8.3 cm) | 2 lbs (0.9 kg) |
Filtered range: 150-A (70 kHz - 100 MHz); PC models (audio to 200 MHz). Pair them for total system cleanup.
Pro Installation Tips for Maximum Results
- Locate the Source: Clip a noise sniffer or test with a portable radio near alternator B+ and ground leads.
- Mount Securely: Use the flanges to bolt near the alternator; keep leads as short as possible (<2 ft) to minimize radiated noise.
- Wire It Right: Connect to the alternator's positive output stud before any splits or regulators. Use marine-grade tinned copper lugs rated for 150A+.
- Ground Well: Ensure a clean chassis ground; add a dedicated one if engine block is noisy.
- Test and Tweak: Fire up electronics post-install—if residual whine lingers, add a PC-series filter at sensitive gear.
Common pitfall: Skipping torque on studs leads to arcing. Tighten to 20-25 in-lbs and check annually.
Real-World Wins: Where It Shines
- Marine Pros: Silences alternator hash on fishfinders and AIS during engine throttle-up.
- RV Warriors: Clears CB radios and entertainment systems from generator/alternator buzz.
- Overland Rigs: Tames interference in ham radios and dash cams over rough terrain.
- High-Power Builds: Handles 200A+ alternators in custom diesel swaps without voltage drop.
Frequently Asked Questions
What causes alternator noise in my boat or RV electronics?
Alternators produce electromagnetic interference (EMI/RFI) as they rectify AC to DC, especially under load. This 'whine' or 'hash' conducts through power wires, disrupting radios, GPS, and displays.
Where exactly do I install the Newmar 150-A filter?
Install it directly in the alternator's positive output lead, as close to the alternator as possible. Brass studs make it simple to splice in high-current cables.
Will this filter work with my 24V system?
Yes, it's rated for 6-48V DC systems, covering 12V marine, 24V commercial, and even 48V setups.
Can I use the 150-A for more than just alternators?
Primarily for alternator outputs, but it excels at suppressing motor or inverter noise too. For low-current gear, pair with PC-10/25 models.
Does it reduce power output or cause voltage drop?
No significant drop—minimal resistance design ensures full 150A flow. Users report stable charging even at full throttle.
How durable is it in wet or salty environments?
Heavy-duty aluminum construction with sealed internals resists corrosion. Ideal for marine use; mount in a dry spot for longevity.
What if noise persists after installation?
Check grounds first, then add filters at equipment ends (like PC-series). Battery isolators or DC blocks can help stubborn cases.
The interference or electronic "noise" generated by alternators, ignition systems, motors, etc., can render a vehicle or vessel's radio or other electronic equipment virtually useless. This interference takes the form of popping or static on radios or audio gear and garbled images or "hash" on video displays.
These specialized filters can be used singly or in combination to attenuate conducted line noise, either at the affected equipment or at the noise source.
Filtered Frequencies
- Model 150A: 70 kHz - 100 MHz
- Models PC-10 and PC-25: Audio - 200 MHz
Filter Features:
- Heavy duty aluminum construction
- Operate on 6-48 VDC systems
- Integral mounting flanges for secure installation
- Brass stud connectors on alternator filters accommodate high current cables and terminals
- Color coded wire leads on all other models make in-line installation easy
| Model | Rating | Installation Location | Size | Weight | ||
| H | W | D | ||||
| 150-A | 150 Amp | In the alternator output lead | 3.25" | 5.75" | 3.25" | 3 lbs. |
| (8.2 | 14.6 | 8.2cm | 1.4Kg.) | |||
| PC-10 | 10 Amp | In the + and - power leads close to affected equipment | 1.25" | 4.25" | 3" | 1 lb. |
| (3.2 | 10.8 | 8.2cm | .5Kg.) | |||
| PC-25 | 25 Amp | Same as PC-10 | 2" | 4.25" | 3.25" | 2 lbs. |
| (5.1 | 10.8 | 8.2cm | .9 Kg.) |
Noise filters Interference or electronic "noise" generated by alternators, ignition systems, electric motors, etc. may make the radio or other electronic equipment of vehicles or ships almost useless. This interference requires...
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Buy with the best price Newmar 150-A Alternator Filter for only $238 from NVN Marine! Same day shipping before 3pm.
Newmar 150-A Alternator Filter Technical Specifications
| Type: | |
|---|---|
| Vendor: |
NewMar |
| Weight: |
4.0 lb |
Newmar 150-A Alternator Filter User Reviews
Newmar 150-A Alternator Filter Shipping & Return
| Shipping Weight: |
4.0 lb |
|---|---|
| Box Sizes: |
1.00 (h) x 1.00 (w) x 1.00 (l) |
| Cubic Feet: |
1.0 |
| Returnable: |
Yes |
| USPS First Class: |
Yes |
| P65: |
Yes |
For detailed shipping policy please check our Shipping Policy and you can find our Return and Refund Policy here.