Voltage Regulator for Johnson Evinrude Outboard 4-60 HP 1977-2001 - Replaces 581778
Voltage Regulator for Johnson Evinrude Outboard 4-60 HP 1977-2001 - Replaces 581778
SKU:RM30432
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4-Wire Voltage Regulator for Johnson and Evinrude Outboards
Johnson and Evinrude outboard engines, 4-60 HP models - 1977-2001
This is a brand new aftermarket 4-wire voltage regulator rectifier for 1977-2001 Johnson and Evinrude outboard engines in the 4 to 60 HP range. It is a direct replacement for the original unit, plug-and-play and direct fit, with no assembly required and nothing to cut or splice. Part number RM30432 replaces OEM 581778.
On a small outboard the regulator rectifier does two jobs at once. It rectifies the alternating current coming off the flywheel charging coils into direct current the battery can accept, and it regulates that output so the battery is charged at a controlled voltage rather than whatever the engine happens to be producing at that moment. This unit is built with a higher grade of electric components than the original, holds a minimum charging voltage of 14.5 V +/- 0.5 V, and is rated to a maximum charging current of 20 A / 150 W with an open circuit voltage below 15 V. It is a compact 63 mm long by 28 mm wide by 34 mm high, with fixing holes 49 mm centre to centre, four plugs, four pins and four wires on 165 mm of lead. It is designed to operate between -20 C and 85 C, and every unit is tested before it is shipped.
Key Features
- Brand new aftermarket voltage regulator rectifier
- Direct replacement to your original unit
- Plug-and-play, direct fit, easy installation
- No assembly required
- Higher grade of electric components
- Quality exceeds the OEM equipment
- 4-wire pattern, 49 mm fixing hole centres
- All products shipped are tested
Technical Specs
| Specification | Detail |
|---|---|
| Part Number | RM30432 |
| Width | 28 mm |
| Length | 63 mm |
| Height | 34 mm |
| Wires Length | 165 mm |
| Fixation Holes Centre to Centre | 49 mm |
| Number of Plugs | 4 |
| Number of Pins | 4 |
| Number of Wires | 4 |
| Minimum Charging Voltage | 14.5 V +/- 0.5 V |
| Maximum Charging Current | 20 A / 150 W |
| Open Circuit Voltage | Below 15 V |
| Operation Temperature | -20 C to 85 C |
Vehicle Fitment Guide
Years shown are the overall coverage span for this part. Please confirm against the OEM part number on your original unit before ordering.
| Make & Model | Years |
|---|---|
| Johnson Outboard 4-60 HP models | 1977-2001 |
| Evinrude Outboard 4-60 HP models | 1977-2001 |
OEM Part Number Cross Reference
Aftermarket replacement. OEM part numbers are listed for reference only.
| Part Number | Manufacturer / Brand |
|---|---|
| 581778 | Johnson / Evinrude / OMC |
Frequently Asked Questions
Does it fit without modification?
Yes. It is a direct fit with the original 49 mm fixing hole centres and the same four-wire pattern, so nothing needs to be drilled or spliced. Confirm that the unit you are removing carries OEM number 581778 and that your engine falls in the 4-60 HP range covered above.
What is included?
One brand new 4-wire voltage regulator rectifier, part number RM30432, with its four plugs on 165 mm of wire. Mounting hardware is not supplied - reuse the fasteners from the original unit.
How do I tell whether the old regulator has failed?
Run the engine and measure across the battery terminals. A working charging system holds around 14.5 V +/- 0.5 V. If the reading sits at resting battery voltage the unit is not charging at all; if it climbs well above 15 V it is overcharging and will boil the battery dry. A battery that is repeatedly flat after a day on the water, with a good stator, is the usual complaint.
Will it cope with a marine environment?
It is built as a direct outboard replacement and is rated for continuous operation from -20 C to 85 C, with a higher grade of electric components than the original. Mount it in the factory position so it keeps the same airflow and cooling path, and keep the connections clean and greased as you would with any outboard electrical part.
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