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 Jeremy R. Your Own Question
Jeremy R.
Jeremy R., Technician
Category: Small Engine
Satisfied Customers: 9019
Experience:  15+ years of experience and a business owner.
Type Your Small Engine Question Here...
Jeremy R. is online now
A new question is answered every 9 seconds

I have a Troy-Bilt 42" Super Bronco Model T609 (13AT609G766)

Resolved Question:

I have a Troy-Bilt 42" Super Bronco Model T609 (13AT609G766) Riding Mower with a B&S 21.0 HP InTek V-Twin OHV Model 400000(NNN) NNN-NNNN, and Automatic w/Cruise. I've used it for several years, but in the past 3, it apparently started to fry batteries because I've had to replace it every season. Nevertheless, the engine started. Most recently, however, I turn the key and got no response whatsoever. Previously, I'd get a weak indication of power and the motor would start to turn over. This time, I got absolutely no life at all.

Here's what I did:
I removed the key from the ignition. I changed the oil, oil filter, gas filter, air filter, and checked the battery with a battery charger. It was a totally new battery, so I would expect and received a notification on the charger that the battery was fully charged. I also checked the one 20 Amp fuse I could find (although I've found in a schematic that there's another fuse somewhere else), and it was good (not blown). I cleaned debris from everywhere I could get my hand into. I filled the gas tank with fresh, clean gasoline and attempted to start it again. I again got no response.

A day later, I checked the battery with the charger again and temporarily reattached the battery cables. This time, when I attempted to start the mower, I noted that the orange indicator light on the ignition panel by the key slot came on when I turned the key past "Stop," but I still got nothing else from the motor. According to the manual, this should have come on (I'm guessing...) only when the "Reverse Push Button" was activated. When I turned off the key and tried a couple more times, the indicator light stopped coming on and I again got nothing.

I looked at the online documentation and found an electric schematic of the mower. I noticed that there are several components on the mower leading up to the motor. Namely, a solenoid, a starter, an alternator, two 20-amp fuses (still trying to find the second one), the key switch, and a "Systems Indicator Monitor," which I don't see any indication of life on the dashboard, assuming that's what the schematic means by this "monitor."

The battery charger I'm using, a Black and Decker 10/6/2 Amp Smart Battery Charger. I hooked up the old battery to this charger and received a diagnostic code of F02, or "Battery voltage too Low to accept charge." In the past, the batteries would also display an F03, or "Internal Open Cell." In both cases, the manual for the charger says to have the battery serviced or replaced. I chose to replace them, but the mower seems to keep damaging the batteries!

I have not yet traced the wiring on the mower - that's my next step. I'm thinking that maybe it's a bad ignition switch. So, I've drained and removed the fuel tank and am starting to look at the backside of the dashpanel. But I'm still not sure of what I'm looking at or for.

I am wondering whether a frequent frying of batteries is caused by a bad starter, solenoid, alternator or something along those lines. And just maybe the bad component finally gave out instead of just shorting out the battery...?

If this is the case, what is the most likely culpret? And where should I begin in replacing these parts? From what I've found on the B&S and Troy-Bilt sites and in the manuals I have, there's nothing around parts or installation of these components (like solenoid, starter, and alternator).
Submitted: 4 years ago.
Category: Small Engine
Expert:  Jeremy R. replied 4 years ago.
Hi, My name isXXXXX you for letting me try and assist you with your problem.
If you were to get a new battery and install it would the mower start up and run?
Even if only for 30 seconds?
Customer: replied 4 years ago.
No. I now have two batteries. The first one seems to be fried (after it actually working a couple of times). The second one -- the one I've tried using now -- is brand new and has only been used to try to start the mower now. Charger says it's fully charged. I've only left it connected to the mower for the duration of my attempts to get it started because I'm of the opinion that it's not the battery, but the other components in the mower. And those other components keep destroying the batteries.
Expert:  Jeremy R. replied 4 years ago.
Ok I see your point.
If you want to try and jump ahead here. Hook up the good battery, turn the key to ON and jump 12 volts to the starter either by jumping the two posts on the starter relay or using a jumper cable or whatever you need to do to get it to crank over.
If the coils and key switch is good it should start and run.
If it does put a meter on the battery and rev the engine and see if you're getting more than 13.5 volts. If you are your regulator is shot and that will fry everything. That's my suspicion as of right now.
Then back to getting it to start you're going to have to check every interlock switch then the starter relay to see if they are what's stopping you from getting it to start now.
Customer: replied 4 years ago.
Ok, thanks for the info. I've not yet gotten a chance to try your suggestions out. I'm confident you've given me good advice. But it won't be until Saturday before I can get to it. And this is the first time I've used this service to get answers. So, once I hit Accept, is it possible to continue the dialog? Or do I have to ask a separate question and take my chances on getting some other expert (with whom I'll have to start all over again)?

Expert:  Jeremy R. replied 4 years ago.
Yep, this thread stays open to you for ever. Any time you want to follow up make a reply and ill get an email notifying me.
Jeremy R., Technician
Category: Small Engine
Satisfied Customers: 9019
Experience: 15+ years of experience and a business owner.
Jeremy R. and 3 other Small Engine Specialists are ready to help you

JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

What Customers are Saying:

  • You did one super job of explaining to me everything there is to know about this fridge. I'm looking forward to asking you questions in the future. Jimmy Bagley, IA
< Previous | Next >
  • You did one super job of explaining to me everything there is to know about this fridge. I'm looking forward to asking you questions in the future. Jimmy Bagley, IA
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C. Freshfield, Liverpool, UK
  • This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!! Alex Los Angeles, CA
  • Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult. GP Hesperia, CA
  • I couldn't be more satisfied! This is the site I will always come to when I need a second opinion. Justin Kernersville, NC
  • Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around. Esther Woodstock, NY
  • Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know. Robin Elkton, Maryland

Meet The Experts:

  • Curtis B.

    Curtis B.


    Satisfied Customers:

    have worked on and around most engine models for 35 yrs./Polaris ATV expert
< Last | Next >
  • Curtis B.'s Avatar

    Curtis B.


    Satisfied Customers:

    have worked on and around most engine models for 35 yrs./Polaris ATV expert
  • Rick's Avatar


    Factory Authorized Trainer

    Satisfied Customers:

    Outdoor Power Equipment technical trainer since 1990, covering eight states.
  • Jon K.'s Avatar

    Jon K.

    Small Engine Diagnostic Expert

    Satisfied Customers:

    Gold certified Stihl tech, Service Manager for a rental/repair shop.Certified in most small engines
  • James W's Avatar

    James W

    Small Engine Troubleshooting Expert

    Satisfied Customers:

    7 years as Mechanic & Parts Manager for Brother who has Owned Lawn & Garden Repair shop for 35 years
  • Vince O.'s Avatar

    Vince O.

    Small Engine Technician

    Satisfied Customers:

    Over 30 years experience repairing lawn and garden equipment. Chainsaws, mowers,blowers and trimmers
  • RUSS's Avatar



    Satisfied Customers:

  • Wayne's Avatar


    Engine Rebuilder

    Satisfied Customers:

    many years on egine rebuilding, lawn mower,roto tiller,Truck,and small engines