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Steve, Motorcycle Mechanic
Category: Motorcycle
Satisfied Customers: 6987
Experience:  30+ yrs. experience, MMI, HD technician, HD early, engine rebuild/performance, bike builder, kit bike program manager, CCI 2001-2004
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I have a 2006 big dog mastiff 117cu will not start, Battery

Customer Question

JA: Hi. What do you want help with?
Customer: Hi :) I have a 2006 big dog mastiff 117cu will not start
JA: Have you checked the battery, particularly the terminal connections? Are they corroded?
Customer: Battery is good, I had it replaced about a year ago… It has been sitting parked in a garage but connected to a charger the whole time
JA: Are you hoping to fix this yourself? What have you tried so far?
Customer: After about three times trying to start it the battery died so I'm now jumping it from a Nother vehicle
JA: Anything else you think the mechanic should know?
Customer: Yeah... When I crank it I can hear it you know it kicks it just won't catch
Submitted: 11 months ago.
Category: Motorcycle
Expert:  Steve replied 11 months ago.

if you jump start that bike from a car you can fry the electronics.

charge the battery, then measure the battery voltage under the following conditions:

- ignition OFF*

- ignition ON*

- with the start button depressed (cranking the starter)*

*with each measurement, note what LED's are lit on the harness controller.

let me know what you find.


Customer: replied 11 months ago.
Thanks Steve, I don't have a voltage tester with me at the moment. I will have to check it out and get back to you. Is that OK?
Customer: replied 11 months ago.
But I can assure you the battery is not the problem. It seems to be related to the carb
Expert:  Steve replied 11 months ago.

brother, if I had a nickle for battery that wasn't the know the rest of the story.

look, I don't know what's going on but I need baseline data to decide what to check next. I also know battery's do not like to set on chargers for a year without going through regular discharge/charge cycles. it can ruin them. not always, but sometimes.

so, humor me and get me the readings when you can.

the LED's on the EHC are important too.

let me know what you find.


Customer: replied 11 months ago.
Hey man.., of course, you are the expert here. Otherwise, I wouldn't be asking for help. Lol. Thanku
Expert:  Steve replied 11 months ago.


let me know what you find.


Expert:  Steve replied 10 months ago.

let me know if you need more help.

if not, please leave a POSITIVE RATING.

thank you,


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