Topic: Wiring Help Needed

[Encierros]

Hello All,

I'm rewiring a 1971 Honda CB750 and don't have the OEM wiring to use as a reference but I've got OEM wiring diagrams.

The trouble I'm having is how to connect a new Rick's Honda Regulator Rectifier. Rick's provides a wiring diagram but the Honda wires are all the same color.

In the attached image, are those two connectors on the left for the the Field Coil? If so, both are black, how do I determine which is positive and negative?

The three on the right are the 3-Phase AC Outputs?? I believe these are the 3 yellow wires in the diagram that get connected to the 5-way mating connector of the new Reg/Rec.

If so, does it matter which order those are attached to the three yellow AC Inputs? If it does matters, how can I determine the correct connection?

How would you wire the Black +12 DCV Feed?

I have the Red DV Positive of the 5-way connected to the Universal Starter Solenoid from Revival Cycles.


Thanks much for any help,
Enc

[calj737]

In your photo of the stock stator, the bundle of 3 wires are YELLOW, and it does not matter which of those connects to which at the Rectifier (Ricks).

The other 2wire bundle are the WHITE and GREEN (field coil and ground). If you use some brake cleaner spray, you’ll probably be able to get them clean enough to see their original colors.

The RR from Ricks, the Black wire was part of the Regulator and needs to provide the battery status to the Regulator. Pick a section of the stock wiring BLACK where it used to connect to the Regulator, and splice it in.

I prefer to run the Ricks RED directly to battery POS, but solenoid is good too if you have a clean connection.

[Encierros]

Thanks for the reply, calj. I really appreciate the help.

Although, I'm still a little unsure of how to proceed with the Black Wire off the Rick's Reg/Rec.

The RR from Ricks, the Black wire was part of the Regulator and needs to provide the battery status to the Regulator. Pick a section of the stock wiring BLACK where it used to connect to the Regulator, and splice it in.

I don't have any stock wiring to use. The battery and starter solenoid have been replaced, and I'm using a Motogadget M-Unit Blue. I'm not sure of what you mean by "battery status." Does the black wire be spliced to a ground?

[calj737]

No! With an M-Unit, it’s really easy. Ricks Black to AUX1 or AUX2 or to LOCK. The Black wire is positive, never splice it to a ground. The stock “ground” wires on the Honda are solid GREEN. All references to BLACK are hot.

The reference to battery status is reading the voltage constantly with the motor running so the Regulator knows how much voltage the Rectifier needs to produce to recharge the battery. The Regulator needs an accurate reference of the battery voltage so it won’t over- or under-charge the battery. Electric start, idling, etc drain the battery. Running the motor above 2,500+ RPMs while riding recharges it.

Since LOCK is activated by the key switch, it’s a switched 12v reference. The voltage there should be identical to the battery (or within 0.1v) for resistance through the harness and switches. Same is true for AUX. The AUX Port is delivered as 12v through the M-Unit, from the battery. It tends to be very close and accurate also.

Hope that is a bit more clear?

[Encierros]

Great! Thanks, again! Huge help.

[Encierros]

Anyone able to help identify what this guy needs to be attached to? 

I'm guessing it's an indicator of some kind? Neutral gear, maybe?

[calj737]

Where does the other end connect?