Mercury Control Switch Mercury 650

[keagernaught]

Ignition Control Wiring Mercury 650

Hey Group,

I have a new topic about a new push-to-choke ignition switch I purchased for the 12V DC ignition system. It is aftermarket and it is marketed as a Magneto ignition system. I assume that will will function the same as a regular ignition system as long as I get the wires on the correct terminals.

The motor:
1971 Mercury 650 4cyl S/N: 2870742

What I do know:
Red- 12V DC Battery
Black- Ground
Yellow- Start
White- Ignition Accessory
Pink- Ignition Kill
Gray- Choke

The Magneto ignition control has 6 Terminals:
B- Battery
C- Choke
I- Ignition
S- Start
MA- Magneto
M- Magneto

I assume that it will work in the same way and I will show how I plan to connect the ignition control,
Red - B (Battery)
Black - M
White - I (ignition)
Yellow - S (Start)
Pink - MA
Gray - C (Choke)

I also plan to add a kill switch to the system and I believe I can connect those to the M and MA terminals to bridge the kill wire directly to ground.

Is this wiring accurate? Also will the kill switch be safe and not cause damage to the ignition coil?

-Thank You in advance.

 

[racerone]

You need to check the wiring diagrams first !!!--------Do not hook up anything until you have verified that you in fact do have the correct switch for a 1971 model 4 cylinder 650.-------Hint----Mistakes can be expensive here.

 

[keagernaught]

I 100% do not have the ignition switch for the 1971 Mercury 650. The original was a separate ignition with a separate push to choke. I have a "universal" push and choke switch. I no longer have the original control box.

 

[racerone]

Make sure you research this because I do not believe a 1971 model 4 cylinder 65 HP uses the 2 " M " terminals

 

[keagernaught]

The model does not have a magneto. It is a battery powered ignition coil system. Based on my research the system should be the same as long as it is hooked up properly. From what I have read if you have one M on ground and the kill switch on the other M terminal then when you turn off the key it will bridge the circuit between the two and ground the spark to kill the engine.

 

[keagernaught]

Hey Group,

I posted this in the electrical forum with no success I was hoping you knowledgeable folks could help me sort through this ignition problem.

I have an aftermarket push-to-choke Magneto ignition system that I want to use on my Mercury 650 with Ignition coil and 12v DC system. I assume that it will function the same as a regular ignition system as long as I get the wires on the correct terminals.

The motor:
1971 Mercury 650 4cyl S/N: 2870742

What I do know:
Red- 12V DC Battery
Black- Ground
Yellow- Start
White- Ignition Accessory
Pink- Ignition Kill
Gray- Choke

The Magneto ignition control has 6 Terminals:
B- Battery
C- Choke
I- Ignition
S- Start
MA- Magneto
M- Magneto

I assume that it will work in the same way and I will show how I plan to connect the ignition control,
Red - B (Battery)
Black - M
White - I (ignition)
Yellow - S (Start)
Pink - MA
Gray - C (Choke)

I also plan to add a kill switch to the system and I believe I can connect those to the M and MA terminals to bridge the kill wire directly to ground.

Is this wiring accurate? Also will the kill switch be safe and not cause damage to the ignition coil?

-Thank You in advance.

 

[alldodge]

Guess I'm not seeing the pink wire on the 650 with your serial number

 

[Chris1956]

If your motor has a distributor, and the above wiring diagram matches your motor, you need ignition power to the switchbox (white wire) to have spark.

The ignition switch you bought will likely work, and your wiring is probably correct.

When you say pink wire, I assume you mean the ignition killer wire, which is orange or salmon, but the color fades and could look pink. You should not need that wire. It may be found in your boat harness harness, but should not have a male pin in the engine harness connector.

 

[keagernaught]

Excellent. I will give it a try once I finish painting and let you guys know. Thank you

 

[Chris1956]

One more thing. Your ignition switch must provide power to the ign wire (white), when the motor is cranking. Most ign switches (but not all) will do that.

 

[keagernaught]

Update: It worked perfectly. With the picture I provided it shows the ignition control connects B-I at the first turn. The engine is now running, but only at high RPM. I cannot get it to idle. That will have to be another discussion.