Wiring help for a 1979 Chysler 45hp

[grampa2sage]

I just bought a 45hp Chysler motor...1979 and I want to put it on a 1989 15' Bayliner that had a 50hp Force. The controls seem the same but I would like to use the wiring from the 1989 because the controls look newer, but the wires are not color coded the same. What should I do? Thanks

 

[Frank Acampora]

Re: Wiring help for a 1979 Chysler 45hp

Well, give us the colors in the existing cable and perhaps we can help. Also supply whether the 45 is magneto or points and coil ignition. The magneto ignition Chrysler 45 will be wired almost exactly the same as the electronic ignition Force engine. Points and coil will be only slightly different. You do not have a major problem.

Red is ALWAYS positive and Black is ALWAYS ground. By process of elimination and by terminal position on the ignition switch, the other colors can be deduced.

 

[grampa2sage]

Re: Wiring help for a 1979 Chysler 45hp

It has points.
Here are the wire colors on the boat (there are only 7 wires)
black w/green stripe
tan
green w/brown stripe
yellow w/black stripe
yellow w/red stripe
green w/white stripe
blue w/white stripe

Here are the colors on the motor (There are 8)

Top to bottom...
yellow...start
purple...generator
white...tach
green...choke
orange...heat
red...battery +
blue...ignition
black...ground

Any help would be great!!!

 

[Frank Acampora]

Re: Wiring help for a 1979 Chysler 45hp

WOW! That's a tough one. If you have a voltmeter, you can test the wires. BTW: both ignition types have points.

I'll give you the location on the switch and tell you what the wire would normally service.

Constant 12 volts will be the battery.
If you have wires connected to the ignition switch:
The wire connected to the "B" terminal will be the constant 12 volts and would connect to the red terminal on the engine. It will usually be a heavier gauge than the others.
If the switch has an "I" terminal or an "A" terminal, this will be switched 12 volts and will power gauges. If the engine is points and coil with the coils on the side of the engine and an alternator, this wire will connect to the blue terminal on the engine. It supplies power to the coils for running.
The wire connected to the "C" terminal ( Probably green with a stripe) will be choke and connects to the green terminal on the engine. It will only have 12 volts when you push in on the key in the start or run position.

If your engine has Magneto ignition with no alternator, the magneto coils will be under the flywheel--just like on a lawn mower. If this is the case, there will be two wires connected to the two "M" terminals. this is the stop circuit. One wire connects to the white terminal on the engine and the other connects to the blue terminal. If you have points and coils, battery ignition, then these two wires are not used.
The wire connected to the "S" terminal is the start wire (most likely one of the yellow wires). It connects to the yellow terminal on the engine.
Purple is almost never used on these engines. It is an A/C signal for the Tachometer on electronic ignition engines. On your engine, with either type ignition White is used for tachometer signal only.

Orange is overheat indicator. If you have an unused wire, not connected to the ignition switch, (likely tan) use it for overheat indicator function. On jumper wire comes from the "I" terminal to one side of the indicator (light or buzzer) Unused wore comes from the other side to the orange terminal on the engine. Orange wire goes from terminal to the switch on the engine head.

In reality, colors are not critical because you dont need all seven so you have the option of rewiring the switch to suit you.

Hope this is some help.