I do a lot of wrenching and electrical work but I am a little stumped here. This is a Deere L120 with 21HP twin Briggs. Battery is testing perfect and so is the starter, yet 50% of the time, when you bump the key, the engine stalls at compression and will not turn over. Once cranking, it will crank perfect and fast.
Armature test shows 1.0 ohms on every contact. No found issues with brushes, commutator, bearings, etc.
Bat should be rated about a 340CCA. Current/voltage test shows at the stalled condition, 300A to starter, 9.5VDC. A batt should provide 1/2 of CCA at 9.5V so that bat is certainly doing what is was advertised to do.
OEM actually specs a lesser CCA bat. I am inclined to throw MORE CCA at it to keep the voltage higher and get more power to the starter.
What the hell am I missing here? Why is a mower with ""65hrs" having this problem?
Armature test shows 1.0 ohms on every contact. No found issues with brushes, commutator, bearings, etc.
Bat should be rated about a 340CCA. Current/voltage test shows at the stalled condition, 300A to starter, 9.5VDC. A batt should provide 1/2 of CCA at 9.5V so that bat is certainly doing what is was advertised to do.
OEM actually specs a lesser CCA bat. I am inclined to throw MORE CCA at it to keep the voltage higher and get more power to the starter.
What the hell am I missing here? Why is a mower with ""65hrs" having this problem?