Ignition Switch Wiring

[speshulldroo]

I'm not sure if this is the right forum....cause it's not technically on the engine.

But I'm working on wiring a 5 post ignition switch into my old lund. Even though I marked the wires, the engine now cranks when the key is "on", and does nothing on "crank". Has anybody else had this happen, or know what might be up? Thanks.

 

[Thad]

Re: Ignition Switch Wiring

Did you replace the switch?
The poles on the new one could be layed out differently.
I would start by attatching the HOT wire to what you know to be the on. Then, take the starter wire(from the on pole) and start testing poles for the right one. Then you have a 50-50 chance of the other two being right. Provided ground is in the right place.

 

[speshulldroo]

Re: Ignition Switch Wiring

That's the weird thing...The old one didn't have a ground, so neither does this one...

Also, there's 5 hot wires in the "harness" (electrical taped bundle) If there's one for the lights, batt power, starter....what would the other two be?

 

[Thad]

Re: Ignition Switch Wiring

It's been a long time. But let's see. No ground, ok.
One: hot to feed the switch.(in)
Two: On to keep power to engine.(out)
Three: send power to starter solenoid to start.
Four: Dash gauges and switches (fuse pannel).
Five: ?drawing a blank...sorry
Someone smarter and who does it often will be more help.

 

[Nandy]

Re: Ignition Switch Wiring

First, dont connect cables randomly, you might end up frying something. I know in my evinrude if I wire it wrong I have about 2 contact that will go zap... This is a very easy job to do if you are electrically inclined. If you are not you might want to consider passing this to someone that is... I have no specific experience with your rig but most all switches works the same. This is for most ob motors which kill the motor by grounding the magneto. Most OB kill the motor by opening the 12 volt feed to the ignition.

The first obvious thing to do is look at that diagram of the new switch and wire it properly. If this is an ob motor you more than likely will have 2 connections going to the magneto, one for ignition on (accessories), one for the starter (solenoid) and one for the choke (when you push the key in). If you labeled your cables as what they do instead of the location of the cable you should be ok.

If you dont have the diagram or you dont know what each cable is for you will need a voltmeter and will have to trace the cables.

Alternatively: Im sure you are replacing that switch for a reason. If the old switch still works then you need to use a voltmeter to find which contacts works with which at different position... for example..

With the switch in the off position:
You should have steady battery (12v) at one connection. This is your battery connection and will always have 12v unless you have a cutoff switch for your battery.
Your 2 magneto connections should be grounded.
The ignition connection should have no voltage and very low impedance.
The starter connection should be same as previous.

With the switch in the on position:
You should have steady battery (12v) in the battery connection.
One magneto connection should will be grounded and the other one will have low impedance.
The ignition connection should have 12 v.
The starter connection should have no voltage and very low impedance.

With the switch in the start (cranking motor) position:
You should have steady battery (12v) in the battery connection.
One magneto connection should will be grounded and the other one will have ac voltage
The ignition connection should have 12 v.
The starter connection should have 12v and the starter should be engaged and turning.

Hope this help and my memory is not failing me... for IB the difference is there is no connection to the magneto.

Good luck!

 

[speshulldroo]

Re: Ignition Switch Wiring

I was wondering, would there be a connection for my electric shift? Or is that powered straight from the batt?

 

[Nandy]

Re: Ignition Switch Wiring

The motor harness should take care of that so I doubt you will have a separate connection. I have to admit I have never work with an electric shift motor.

Is the old switch still available and somehow operational?

 

[speshulldroo]

Re: Ignition Switch Wiring

It is available, however I'm replacing it because the key broke off inside of it...

Using a test light I have it now where it cranks on "crank", but I think I have the magneto wires wrong, because it won't catch when it cranks. (I'm thinking no spark, about to find a second person so I can test it).

 

[speshulldroo]

Re: Ignition Switch Wiring

Okay, well, I have the constant hot figured out as well as the starter wire...but no matter where I put the other red wires, I'm not getting any spark. Does that make sense?

 

[Nandy]

Re: Ignition Switch Wiring

What type of power plant (motor)you have? Type and model, i might be able to help you.

 

[speshulldroo]

Re: Ignition Switch Wiring

It's a 1969 Evinrude Triumph 55hp.

 

[Nandy]

Re: Ignition Switch Wiring

Which of these is it? The motor label should have the model in it. Not sure they are all the same in the remote. I will check what I find while you check that.

55972A 1969
55972C 1969
55973A 1969
55973C 1969

 

[speshulldroo]

Re: Ignition Switch Wiring

55973A.

sorry, shoulda threw that in w/ the last post.

 

[Nandy]

Re: Ignition Switch Wiring

The diagram does not have colors so I cant tell. searching and alternate option but it might take a bit.....

 

[speshulldroo]

Re: Ignition Switch Wiring

Don't inconvienence yourself. Any help is much appreciated, but I don't wanna be a pain.

 

[Nandy]

Re: Ignition Switch Wiring

No problem, I like to help. I cannot find any diagram with the info I need. Which brand/model switch you bought and where?

 

[speshulldroo]

Re: Ignition Switch Wiring

It is a Sierra MP39100 That I bought at my local marina.

 

[Nandy]

Re: Ignition Switch Wiring

I will assume you have the diagram for the new switch. If not here it is. Yours is lower left.
http://ww2.sierramarine.com/catalog_pdf_8025/8025-9.pdf

Anyway, so you know where the battery and solenoid cable goes. How many cables you have left to connect.

 

[speshulldroo]

Re: Ignition Switch Wiring

I have four wires that are all red and were all piggybacked onto the same terminal on the old switch.

 

[Nandy]

Re: Ignition Switch Wiring

I have four wires that are all red and were all piggybacked onto the same terminal on the old switch.

Ok, if that is true then those are your accessory wires which goes to connection A. You have a separate choke switch, right? If so one of those 4 wires will be the choke. Strange you dont have a magneto cable. Just in case, if you try to start it after connecting those cables then make sure you have the water running as if the magneto cable dont get short the motor will not stop until it run out of gas or you disconnect the spark plugs. Be ready for that situation.

You have the battery to the b terminal connection.
You have the starter to the S terminal connection
You dont have any wires connected to the 2 M terminal connections.
You will connect the 4 remaining connectors to the A terminal connection.
Is all the above true? If so, then you had a 3 terminal connection switch or did you have a 5 terminal connection switch with 2 terminal connections not used?