Small Engines (Lawn Mowers, etc.): Ignition switch for a snowblower, solenoid starter, starter solenoid


Question
QUESTION: I have a 7-01854 Prime Line ignition switch.  I am looking for a wiring diagram to tell me which pins are connected to what.  The snowblower only has 3 wires ( black, red, and a wire going to starter).  The new ignition switch has 5 pins and are labeled B,R,A,I,S.  Can you please tell me where the wires go as I am confused.  Sounds easy enough with only 3 wires but the old switch has the letters B,G,S,M,?(I can't see the last letter).  It's getting pretty close to snow around here and I'd like for the electric start to work.  It's on a John Deere 826.  Thanks in advance.

ANSWER: Check out the link below...starting on page 21.

http://www4.briggsandstratton.com/miscpdfs/RNT/alternator_replacement.pdf

B = Battery  This is always hot, 12 volts DC
G = Ground
M = Magneto...engine stop switch
S = Solenoid (Starter Solenoid)
L = Lights

S, and B should be the same on each switch.  "I" might be the same as "M".  Do you have a multimeter to test the switch to verify "I"?

Does the blower have a 12 volts electric starter and/or a light?

Eric

---------- FOLLOW-UP ----------

QUESTION: What is the R & A do then?  I have B,R,A,I,S on my switch.  Not B,G,M,S,L.  B is battery, S is solenoid, But I don't have a G on my switch.  Which is a ground on my switch?

Answer
Check out this link:

http://www.jackssmallengines.com/rep_switches.cfm

The switch you have is designed for a battery ignition system, the kind like old cars used.  When you turn the switch off it removes 12 volts DC from the automotive style coil.

The 826 you have needs to have a ground.  When you turn the key off the switch grounds the primary winding of the ignition module which stops the spark thus turning the engine off.

You can use a multimeter to check to see if the switch you have has a ground with the key off.  You could wire it up but it would take some work.  

If it were me I would buy a new switch, one for magneto ignition systems.  All mowers since about 1981 use the newer type switches with the ground.

Eric