V-Twin Forum banner

1 - 8 of 8 Posts

·
Registered
Joined
·
5 Posts
Discussion Starter #1
I have a really strange issue with my Fat Bob. It is slightly modded with V&H Short shots, K&N high flow filter assembly, Andrews 57h cams and V&H Fuelpak tuner and tuned for mods. Today it started just fine and idled normally, but when I twisted the throttle the neutral light went off along with the speedometer light. The idle then began to climb and when I looked at the fuelpak all of its lights were off. When I pulled the codes it showed ECU comm failure and high voltage to speedometer. I re-flashed, cranked again, idle was fine then barely twisted the throttle again dash lights went off and fuelpak lost connection, did this 3 times with same codes. Re-flashed to factory settings and disconnected the fuelpak. Tried again same results and codes. Could I have a bad ECU or something else I’m missing?
 

·
Premium Member
Joined
·
2,345 Posts
I would look for a bad or dirty connection related to your install of the fuel pack.
 

·
Premium Member
Joined
·
1,431 Posts
if your getting a high voltage code I would check battery voltage when your giving it gas , its possible you could have a voltage regulator issue and be over charging .
 

·
Registered
Joined
·
5 Posts
Discussion Starter #5
So I check the voltage at the battery while it was idling and it was at 18 volts and climbing. I’m assuming this is way too high and I have a bad regulator, could that be the problem?
 

·
Super Moderator
Joined
·
2,646 Posts
18 volts is high voltage.Did you check with an accurate voltage meter or multimeter? If your readings are accurate then check for good and clean connections first.
 

·
Premium Member
Joined
·
1,431 Posts
18 is way to high , running you should see approx. 13.5-14V , there was a recall on the 2012 models for a voltage regulator issue , you may want to see if yours was done or was included in the recall
 

·
Registered
Joined
·
5 Posts
Discussion Starter #8
Thanks for the help, put on a new regulator and everything is working great, 14.4 volts at idle.
 
1 - 8 of 8 Posts
Top