Aftermarket Parts
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Sold Out, please call for ETA.Special Order! See availaility for details
Sierra Alternator Cummins 24V 65A 18-6952
Sierra
$556.39 $22.10Sierra Alternator Cummins 24V 65A 18-6952These all NEW replacement alternators meet OEM specs and meet or exceed OEM output for guaranteed performance. Fans; pulleys and hardware are plated to resist corrosion and special marine flame arrestor screens...- Part Number:
- 47-6952
- Availability:
- In Stock - Ships same or next business day.
- Fits:
- Cummins/Delco
- Type:
- New
- OEM #:
- Cummins 214169 - 3603853RX - 3920618
Delco 10459244 - 1100077 - 1100093 - 1100211 - 1100274 - 1105474 - 1105475 - 1105476
$556.39 $22.10 -
Sierra Alternator Vp#3862613 12V 75A 18-6847
Sierra
$369.89 $295.27Sierra Alternator Vp#3862613 12V 75A 18-6847These all NEW replacement alternators meet OEM specs and meet or exceed OEM output for guaranteed performance. Fans; pulleys and hardware are plated to resist corrosion and special marine flame arrestor screens...- Part Number:
- 47-6847
- Availability:
- In Stock - Ships same or next business day.
- Fits:
- Volvo
- Type:
- New
- OEM #:
- Volvo 3862613 - 265530
$369.89 $295.27 -
Sierra Alternator-55Amp Volvo#3860082 18-5979
Sierra
$310.79 $251.40Sierra Alternator-55Amp Volvo#3860082 18-5979- Part Number:
- 47-5979
- Availability:
- In Stock - Ships same or next business day.
$310.79 $251.40 -
Sierra Alternator-65Amp Mando 1 Groove 18-6261
Sierra
$303.89 $248.20Sierra Alternator-65Amp Mando 1 Groove 18-6261- Part Number:
- 47-6261
- Availability:
- In Stock - Ships same or next business day.
- Fits:
- OMC -
Volvo - OEM #:
- 987774/3854182/3854809/3856600/3860171
3857561 - 3856600-6 - 3857561 - Type:
- New
$303.89 $248.20 -
Sold Out, please call for ETA.
Sierra Alternator-68Amp 3-Wire Serp 18-5945
Sierra
$12.80Sierra Alternator-68Amp 3-Wire Serp 18-5945- Part Number:
- 47-5945
- Availability:
- In Stock - Ships same or next business day.
- Fits:
- Mercruiser
- OEM #:
- Mando/Motorola/Delco
- Type:
- New
$12.80 -
Sierra Alternator-70A Spool Mnt 1 Groove 18-6288
Sierra
$318.29 $281.78Sierra Alternator-70A Spool Mnt 1 Groove 18-6288- Part Number:
- 47-6288
- Availability:
- In Stock - Ships same or next business day.
$318.29 $281.78 -
Sold Out, please call for ETA.
Sierra Alternator-70A Spool Mnt 2 Groove 18-6299
Sierra
$12.80Sierra Alternator-70A Spool Mnt 2 Groove 18-6299- Part Number:
- 47-6299
- Availability:
- In Stock - Ships same or next business day.
$12.80 -
Sierra Alternator-70A Spool Mnt Serp 18-5984
Sierra
$363.29 $283.73Sierra Alternator-70A Spool Mnt Serp 18-5984- Part Number:
- 47-5984
- Availability:
- In Stock - Ships same or next business day.
$363.29 $283.73 -
Sierra Alternator-Nla MerCruiser #857006A 3 18-6844
Sierra
$457.89 $356.27Sierra Alternator-Nla MerCruiser #857006A 3 18-6844These all NEW replacement alternators meet OEM specs and meet or exceed OEM output for guaranteed performance. Fans; pulleys and hardware are plated to resist corrosion and special marine flame arrestor...- Part Number:
- 47-6844
- Availability:
- In Stock - Ships same or next business day.
- Type:
- New
- Fits:
- Mercury/Denso
- OEM #:
- 834832 - 834832T2 - 857006A3/ 101211-3460
$457.89 $356.27 -
Sold Out, please call for ETA.
Sierra Alternator-Rem 68A 3Wire W/Pul 18-5951
Sierra
$12.80Sierra Alternator-Rem 68A 3Wire W/Pul 18-5951- Part Number:
- 47-5951
- Availability:
- In Stock - Ships same or next business day.
- Fits:
- Mercruiser -
OMC -
Pleasurecraft -
Volvo - OEM #:
- 78477/78403A2/92497A3
98236
RA097002/RA097003/RA097006 - 3860769 - Type:
- Reman
$12.80 -
Sold Out, please call for ETA.
Sierra Alternator-Yanmar Lh 80A 18-6929
Sierra
$270.59 $233.03Sierra Alternator-Yanmar Lh 80A 18-6929These all NEW replacement alternators meet OEM specs and meet or exceed OEM output for guaranteed performance. Fans; pulleys and hardware are plated to resist corrosion and special marine flame arrestor screens...- Part Number:
- 47-6929
- Availability:
- In Stock - Ships same or next business day.
- Fits:
- Yanmar/Hitachi
- Type:
- New
- OEM #:
- Yanmar 119573-77200 - 119573-77201 - 129470-77200
Hitachi LR180-03A - LR180-03B - LR180-03C
$270.59 $233.03 -
Sold Out, please call for ETA.
Sierra Alternatr 75A Vp 3.0Glm-3.0Glp 18-6845
Sierra
$287.39 $22.10Sierra Alternatr 75A Vp 3.0Glm-3.0Glp 18-6845These all NEW replacement alternators meet OEM specs and meet or exceed OEM output for guaranteed performance. Fans; pulleys and hardware are plated to resist corrosion and special marine flame arrestor...- Part Number:
- 47-6845
- Availability:
- In Stock - Ships same or next business day.
- Fits:
- Volvo
- Type:
- New
- OEM #:
- Volvo 3862613 - 3862665 - 3884950
$287.39 $22.10 -
Sold Out, please call for ETA.
Sierra Amega 6-Gauge Set W-Tach-Hr 69709P
Sierra
$408.09 $3.90Sierra Amega 6-Gauge Set W-Tach-Hr 69709PSmart white and red graphics on a black dial background; these very low profile bezels follow the curve of the lenses to eliminate water trapping. Design with domed glass sheds water and resists scratching...- Part Number:
- 11-69709P
- Availability:
- In Stock - Ships same or next business day.
- Size:
- -
- Type:
- 6 Gauge Set -Tach/Hourmeter (to 7 -000 rpm) - Speedo (to 65 mph) - Voltmeter (12-volt system) - Fuel (requires tank w/240-33 ohm sender) - Water Temp 120-240 Deg - - Oil Pressure 0-80 psi
- Sender Code:
- C - D - F
$408.09 $3.90 -
Sold Out, please call for ETA.
Sierra Amega Domed 3 Speedo Head 57900Ph
Sierra
$74.49 $1.30Sierra Amega Domed 3 Speedo Head 57900PhSmart white and red graphics on a black dial background; these very low profile bezels follow the curve of the lenses to eliminate water trapping. Design with domed glass sheds water and resists scratching...- Part Number:
- 11-57900PH
- Availability:
- In Stock - Ships same or next business day.
- Size:
- 3"
- Type:
- Speedo (head only)
- Dial Range:
- 10-65 mph
- Sender Code:
- G included
$74.49 $1.30 -
Sold Out, please call for ETA.
Sierra Amega Domed 3 Speedometer 57898P
Sierra
$122.69 $81.43Sierra Amega Domed 3 Speedometer 57898PSmart white and red graphics on a black dial background; these very low profile bezels follow the curve of the lenses to eliminate water trapping. Design with domed glass sheds water and resists scratching...- Part Number:
- 11-57898P
- Availability:
- In Stock - Ships same or next business day.
- Size:
- 3"
- Type:
- Speedo Kit (includes pitot and hose)
- Dial Range:
- 10-50 mph
- Sender Code:
- G included
$122.69 $81.43 -
Sold Out, please call for ETA.
Sierra Amega Domed 3 Speedometer 58342Ph
Sierra
$74.49 $1.30Sierra Amega Domed 3 Speedometer 58342PhSmart white and red graphics on a black dial background; these very low profile bezels follow the curve of the lenses to eliminate water trapping. Design with domed glass sheds water and resists scratching...- Part Number:
- 11-58342PH
- Availability:
- In Stock - Ships same or next business day.
- Size:
- 3"
- Type:
- Speedo (head only)
- Dial Range:
- 5-35 mph
- Sender Code:
- G included
$74.49 $1.30 -
Sold Out, please call for ETA.
Sierra Amega Domed Speedo Kit 80 Mph 57899P
Sierra
$92.39 $3.90Sierra Amega Domed Speedo Kit 80 Mph 57899PSmart white and red graphics on a black dial background; these very low profile bezels follow the curve of the lenses to eliminate water trapping. Design with domed glass sheds water and resists scratching...- Part Number:
- 11-57899P
- Availability:
- In Stock - Ships same or next business day.
- Size:
- 3"
- Type:
- Speedo Kit (includes pitot and hose)
- Dial Range:
- 20-80 mph
- Sender Code:
- G included
$92.39 $3.90 -
Sold Out, please call for ETA.
Sierra Amega Doomed 2 Warning Light 65668Bmdp
Sierra
$0.00Sierra Amega Doomed 2 Warning Light 65668BmdpSmart white and red graphics on a black dial background; these very low profile bezels follow the curve of the lenses to eliminate water trapping. Design with domed glass sheds water and resists scratching...- Part Number:
- 11-65668BMDP
- Availability:
- In Stock - Ships same or next business day.
- Size:
- 2"
- Type:
- Warning Light - Suzuki
- Dial Range:
- System Data
- Sender Code:
- Engine Mfr. Supply
$0.00 -
Sierra Amega Gauge Kit-Water Temp O/B 58862P
Sierra
$109.79 $70.38Sierra Amega Gauge Kit-Water Temp O/B 58862PSmart white and red graphics on a black dial background; these very low profile bezels follow the curve of the lenses to eliminate water trapping. Design with domed glass sheds water and resists scratching...- Part Number:
- 11-58862P
- Availability:
- In Stock - Ships same or next business day.
- Size:
- 2"
- Type:
- Water Temp Kit - Outboard (Cold/Hot)
- Dial Range:
- 100 Deg - F-220 Deg - F
- Sender Code:
- J included
$109.79 $70.38 -
Sold Out, please call for ETA.
Sierra Amega Instr Set I/B Strndrive 68363P
Sierra
$409.59 $257.48Sierra Amega Instr Set I/B Strndrive 68363PSmart white and red graphics on a black dial background; these very low profile bezels follow the curve of the lenses to eliminate water trapping. Design with domed glass sheds water and resists scratching...- Part Number:
- 11-68363P
- Availability:
- In Stock - Ships same or next business day.
- Size:
- -
- Type:
- 6 Gauge Set -Tach (to 7 -000 rpm) - Speedo(to 65 mph) - Voltmeter (12-volt system) -
Fuel (requires tank w/ 240-33 ohm sender) - Water Temp 120-240 Deg - - Oil Pressure 0-80 psi - Sender Code:
- C - D - F
$409.59 $257.48
Aftermarket Boat Parts & Marine Engine Supplies
Looking for dependable aftermarket boat parts? PowerBoatSupply.com carries a wide selection of aftermarket marine parts, engine supplies, oils, fuel components, steering parts, anodes, tools, and maintenance essentials for boat owners and marine professionals.
Whether you're handling routine service, replacing worn components, or stocking up for the season, our aftermarket parts selection helps keep your boat running smoothly and reliably.
Marine Engine Parts & Maintenance Essentials
Keep your motor protected and performing with key maintenance categories like engine parts, motor oil, marine oil systems and accessories, and lubricants, fluids and sealants.
- Engine Parts – Replacement components for service and repair
- Motor Oil – Marine-grade oils for routine maintenance
- Oil Systems & Accessories – Helpful products for oil changes and upkeep
- Lubricants, Fluids & Sealants – Protect, seal, and maintain marine systems
Fuel, Steering & Control Parts
Reliable fuel delivery and responsive steering are critical on the water. Browse marine fuel parts and steering and controls to help maintain safer handling, smoother operation, and dependable performance.
- Fuel Parts – Components for reliable fuel system performance
- Steering & Controls – Parts that help improve control and handling
- Engine Instruments – Monitor key systems while underway
- Engine Tools – Tools for maintenance, repair, and service work
Anodes, Instruments & Service Tools
Small parts can make a big difference in long-term protection and performance. Shop marine anodes, engine instruments, and engine tools to help protect your boat, monitor performance, and complete service work more efficiently.
- Anodes – Help protect metal components from corrosion
- Engine Instruments – Gauges and monitoring products for marine engines
- Engine Tools – Service tools for DIY boaters and marine technicians
- Maintenance Supplies – Everyday essentials for seasonal upkeep
Yamaha Oil Change Kits & Routine Service Products
Staying ahead of routine service is one of the best ways to protect your investment. PowerBoatSupply.com also carries Yamaha oil change kits and other service products that make maintenance easier and more convenient.
- Oil Change Kits – Convenient service kits for scheduled maintenance
- Marine Oils – Protect engines under real boating conditions
- Sealants & Fluids – Support repairs, installs, and regular service
- Tools & Accessories – Make maintenance faster and cleaner
Why Buy Aftermarket Marine Parts from PowerBoatSupply.com?
PowerBoatSupply.com helps boat owners find reliable parts and maintenance products without the guesswork. From routine oil service to engine repair, fuel system work, corrosion protection, and steering maintenance, our aftermarket category is built to support the jobs boaters handle every season.
- Wide selection of aftermarket boat parts and marine supplies
- Products for DIY boat owners and marine professionals
- Helpful categories for seasonal service and repairs
- Fast shipping and dependable support
Shop aftermarket boat parts today and get the engine parts, oils, fuel components, steering supplies, anodes, tools, and maintenance products you need to keep your boat ready for the water.