Hi all,
SPX2246 (2691021) w/ Briggs 40H777-0151-G5
Problem - Cranking circuit fails.
My normal starting place in this situation is battery, which is fine.
Next - is there 12v coming to the solenoid coil upon depressing starter button - NO.
The "Black Box" issues the 12v to the starter solenoid if all of the interlock conditions are met, which they were.
What I found (and the motivation for my post) is the Black Box will issue 12v to the starter solenoid if the Engine Plug is disconnected. The Engine Plug receives 12v to the engine from the load relay, issues the alternator output to the 12v system and interconnects *SOMETHING to the black box. The engine plug (via pin 2) connects to the black box on pin 11 which is labeled "magneto kill."
The magneto kill signal is usually thought of as being part of the shutdown circuit - as opposed to the cranking circuit. However it makes sense that the unspoken condition for cranking would be that the shutdown circuit is not active.
Shutdown circuit being active is comprised of any of the following : rider off of seat without brake pedal locked in down position, reverse pedal attempted without agreement from the NO MOW module, a button press while running (which is a nonsensical condition for this scenario) or the key is removed. Each of those conditions will present a ground to both pin 2 on the engine plug and to pin 11 on the Black Box.
In my case pin 2 on the engine side is presenting a ground to the circuit. Thus the machine believes it is being ask to crank and shutdown at the same time.
My question - What does pin 2 on the engine plug connect to on the engine side ? I want to assume that what it does is stops the magneto by grounding its output. Would that be a safe assumption ? But what actually does that inside the engine and could it malfunction in such a way that it is permanently grounded ?
Thanks in advance, any help is appreciated. Oh yeah, that engine is discontinued so could not get any details from Briggs. Snapper has no details on it either.
The ignition module mounted next to the flywheel is stand alone and there is no voltage input to make it work. It has a wire (kill lead) that attaches to the side of the ignition module and yes when that wire has continuity to ground, the output of the high tension lead (plug wire) going to the spark plug is turned off and the engine stops.
