How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Curtis B. Your Own Question
Curtis B.
Curtis B., Technician
Category: Small Engine
Satisfied Customers: 25634
Experience:  have worked on and around most engine models for 35 yrs./Polaris ATV expert
Type Your Small Engine Question Here...
Curtis B. is online now
A new question is answered every 9 seconds

My riding lawnmower wont charge the battery. I have to jump

Resolved Question:

My riding lawnmower won't charge the battery. I have to jump it with my truck when I use it. The battery is only a year old. What mechanism (like an alternator) is supposed to do this. How do I check it? - Larry
Submitted: 6 years ago.
Category: Small Engine
Expert:  Curtis B. replied 6 years ago.
The alternator is located under the flywheel of the engine, it comes out from under the flywheel and goes to a rectifier(regulator) and then goes to the battery positive side. The first thing you need to check is the battery voltage with unit dead. You should have at least 12.5 volts. Then while cranking unit watch voltmeter on battery, voltage should not drop below 9 volts, then with engine at half throttle, check the voltage again at battery, if the alternator is charging, the voltage should increase to over 13 volts. If no increase, then you need to check the voltage at the alternator output and the rectifier to see which is the problem. Check the battery first and let me know what you find. Then we can go into the charging system if needed. Thanks.
Curtis B. and 2 other Small Engine Specialists are ready to help you

Related Small Engine Questions