Rectifier Honda 31700-358 31700-292 31700-046 31700-351
Please Note: Wire connection block may need modifying by unclipping wires with a small flathead screwdriver and swapping or use your old block connector where necessary. Make sure that the pink wire goes to the generator.
- For 6v or 12v systems
- 4 wires – red, pink, green and yellow
- Single bolt mounting
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This 4-wire rectifier is compatible with many 6v Honda models. Below is a general wiring guide to assist with installation:
| Wire Colour | Connects To | Function |
|---|---|---|
| Yellow | Alternator (AC output) | AC input from stator |
| Pink | Alternator (AC output) | AC input from stator |
| Red | Battery positive terminal (+) | DC output to charge battery |
| Green | Frame or battery negative terminal (–) | Ground / Earth |
Note: Some models may use only one AC wire (usually yellow) instead of yellow and pink. Always refer to your bike’s wiring diagram for verification.
Replacement aftermarket part for Honda OEM:
- 31700-046-751, 31700-046-791, 31700-292-008, 31700-455-671, 31700-358-305, 31700-358-003, 31700-358-013, 31700-303-033, 31700-307-013, 31700-351-003, 31700-351-008
- and many more TBA
This will suit the following models as well as those listed in fitments:
- Honda CA175 K3 1969
- Honda CJ360 T 1976-77
- Honda CL175 Scrambler 1969-73
- Honda CL200 Scrambler 1974
- Honda MT250 Elsinore 1974-76
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Regulator/Rectifier Fitting Instructions
When on test, 12 Volt batteries should show an output of 13.2 Volts. When the engine is running this would increase to between 14 and 15 Volts.
Yamaha and certain Honda motorcycle’s use a three-phase type system, with a permanent magnet instead of an electromagnet, to regulate the current from the alternator.
Rather than controlling the output from the alternator, the excess voltage would be dumped by means of heat transfer.
To improve the transfer of heat from the regulator/rectifier you can use a silicone heat sink compound which is placed on the back of the regulator/rectifier and on the mounting point. Both surfaces must be clean for better contact and heat transference.
Also, to improve the earth of the regulator/rectifier, a cable can be introduced on one of the mounting bolts and connected directly to the negative terminal of the battery (earth side). This would eliminate the unreliable arrangement of earth fittings that are connected to various parts of the frame or motorcycle that does not always work. This type of earth is used as standard on some Yamaha and Honda motorcycles.
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