1985 Simplicity Broadmoor - no crank + stall
I have a 1985 Simplicity Broadmoor, p/n 1692416. Kohler engine.
I occasionally have had an intermittent - A). "no crank" condition that I attributed to loose cables, dirty connections, etc. If I moved wires around (or waited), it cured itself. This no crank has become more frequent along with a new condition, B). where the mower stalls when the PTO (blades) are engaged.
I do not have a schematic.
I have not load tested the battery.
Battery volts = 12.47
I ohmed out all of the wires that I could find and have verified proper safety switch function on the safety switches (seat, foot brake, and neutral switch). Circuits have isolation from ground and the other wires in their shared connectors. I looked at PTO and circuits leading to ignition module and coil - nothing is cut, shorted, frayed, etc.
Once the mower starts, if I disconnect the "interlock module" it will NOT stall and the engine has normal power and normal function in F and R. I assume that this eliminates chance of - bad ignition switch, failing coil, plugged carb (recently cleaned and float reset), or weak fuel pump.
When the PTO makes the engine stumble.. as soon as the PTO is turned off, mower runs 100% fine again. Or, when it stumbles and I pull the interlock "black box".
If I intentionally create/remove the conditions for the fault, it feels like a intermittent ignition misfire.
I am pretty starved for time.
It seems to me that the "rider is sitting in mower seat " safety circuit inside of interlock module is failing.
This module costs $50+ and I want to be sure that it
is the problem.
Or, if someone has a schematic + workaround (using an automotive relay instead of module) I would greatly appreciate it.
Thanks in advance, Marty
rustyj14
mownie
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