Logo
FULL SITE MENU

Evinrude 1972 50hp ignition help

A

AndyP3

New member
Hey guys,

I've got a 1973 50hp engine, and I can't diagnose a starting problem. I've got 12.79V across the top main, and top small pin of the solenoid, so I believe the solenoid is okay. If I bypass the solenoid, the starter motor pops up fine, and the motor cranks very well. So I believe the rest of the motor is fine. Just need some help with the wiring.

I've used a voltmeter on the engine side of the loom, and I'm getting 0.13V from one of the large pins in the loom. The 2 other large, and the rest of the small pins are all reading zero. I believe this is expected, as from what I've read there is only one wire which holds the main current for the control box.

At the ignition barrel end of the wires, I'm getting 0.13V out of a purple wire, and nothing from anything else. From what I've read, the wire carrying the current should be red, however it's definitely purple. Any suggestions on how to wire the rest of the ignition to the barrel? The remaining wires are purple, white, brown, red, black and black with a yellow stripe.

Any help is greatly appreciated. Many thanks,
Andy.
 
Your not being clear on the issue. When you bypass the solenoid does the engine run with the key on? If you are getting 12 volts to the small terminals on the solenoid and it dont turn the starter it is likely the shift safety switch the controls must be in neutral. What is the model number of the motor?
 
I've currently not got the barrel attached, and am more wondering if I'm able to put them back in the original order given the fact that the red wire hasn't got any voltage, and the purple wire (which is meant to be accessory) has all the current. The ignition barrel isn't wired up, so the key wouldn't do anything.
The shift safety switch has been bypassed, so that is irrelevant I'd believe. The help is more about where the wires go on the barrel.

As for the model number, I can't get at it due to the tilt/trim aftermarket covering it. I do have a parts motor which is identical which has model number 50272C

Thanks,
Andy.
 
What is a barrel? Cranking is when the starter is turning and starting is when the motor starts running.
I cannot find the diagram for your motor ther are 3 different gearboxes 1972-1973 mechanic shift, hydro mechanical and hydro electric depending on your model numbers. You need to be real careful when wiring the ignition switch shorting the kill wire to battery posative will cook the powerpack. You can probably use this diagram just disconnect the battery until you know all the wires are correct and please take the time to get the safety switch working properly. If the engine starts in gear it can be deadly.
http://www.maxrules.com/graphics/omc/wiring/1972_65_Eshift.jpg
 
Sorry, not sure if barrel is an Aussie term or not. The 'barrel' is where the key goes. That's what we refer to as the ignition barrel.

It's a mechanical shift gearbox, it has the standard teleflex cables for the gear selector. The diagram provided isn't for the motor as the 'barrel' has a red wire going to the key start also, which isn't pictured.

I've managed to get the red wire to gain voltage though. Now just curious as to how to connect the loom to the key switch.

Thanks,
Andrew.
 
I have the original yellow loom, and also a newer red loom.
Any idea which colour goes where on the ignition key switch?
 
The big yellow plug is only used on the 71 / 72 models with electric shift.-------If your powerhead has a big red plug it is not a 72 model.
 
From what your saying the wire with full time battery voltage goes to the Bat or B terminal choke goes to C. start wire goes to S ground goes to M and kill wire goes to the other M. Never touch battery voltage to the kill wire even a split second will fry the powerpack.
http://www.maxrules.com/graphics/omc/wiring/1972_65_Eshift.jpg
Is there a white stripe on the purple wire that has battery voltage? It looks like all the aftermarket manuals changed between 1972 and 1973 so it depends what engine your working on for the correct diagram. Is your ignition switch push to choke? We cannot tell you for sure until you properly identify the engine your working on. Also is the barrel in the controls or on the dash. Mechanical shift or electric?
This diagram should get you to where you need to be.
 
Back
Top