Johnson and Battery

catbones

catbones

Petty Officer 1st Class
Joined
Jul 15, 2012
Messages
319
Hi,

So here is a silly question and I'm guessing this pretty much works just like a car would. I have a Johnson from the 1960's and a battery. Now I have a few questions;

1.) How long would my battery last?

2.) Now does it work just like a car, it is used to fire up the engine and then for spark plugs? mine doesn't have the alternator I'm guessing which is the guy I bought it from talked about that he could install for extra $100.

3.) If I don't have an alternator can't I install one myself as a part?

I just want to make sure that hopping onto the water I won't have a dead engine in 30 minutes to an hour on a fully charged marine battery.

Thank you.
 
catbones

catbones

Petty Officer 1st Class
Joined
Jul 15, 2012
Messages
319
Re: Johnson and Battery

Ooops. Just noticed this is in the wrong topic, can the admin move this and I do apologize.
 
H

H20Rat

Vice Admiral
Joined
Mar 8, 2009
Messages
5,201
Re: Johnson and Battery

So no old outboards have alternators. (need to get into 4 stroke fuel injected to get an alternator, and even then, not always) Outboards have stators that serve a similar purpose, just at a lower output. Also, the battery never runs the spark plugs directly. All engines have a charging system of some sort that runs the plugs. In the case of an outboard, it is a different winding on the stator that is meant just for ignition.
 
Oshkosh1

Oshkosh1

Ensign
Joined
Jun 8, 2009
Messages
968
Re: Johnson and Battery

You would only NEED a battery(for the motor) if it has electric start...If not, it's just there to run lights/accesories/trolling motor.
 
T

tx1961whaler

Vice Admiral
Joined
May 31, 2008
Messages
5,197
Re: Johnson and Battery

What is the model number? Johnson made many motors in the 1960's.....
 
C

Chris1956

Supreme Mariner
Joined
Mar 25, 2004
Messages
27,140
Re: Johnson and Battery

Catbones, generally speaking, Johnnyrudes from the 60 are magneto ignitions, so no battery voltage is required to operate them. Some V4 motors had battery/coil ignition like a car, of that era. These required generators or alternators. The electric shift motors needed some way to charge the battery, as well. The early 60s motors with a battery charging capability had belt driven generators and mechanical voltage reglators. Later motors had alternators (thery are really magnets+ stators, but we call them alternators).
 
You must log in or register to reply here.
Top