Ignition spark randomly dropping
Thread Starter
|
Intermediate
Joined: Nov 2018
Posts: 33
Likes: 0
From: Leamington, ON, Canada
Ignition spark randomly dropping
If I didn’t shave my head I’d have it all pulled out at this point. I have a 91 flhtcu 80” carbureted. The bike is dropping spark (only way I know how to explain it) randomly. Becoming more often now but just looking for advice. Replaced plugs, wires and magnetic pickup (cam sensor) at this point. Coil seems to be fine based on resistance check. Will the ignition module cause an issue like this? Thanks for any input in advance.
Seasoned HDF Member
Joined: Mar 2010
Posts: 21,008
Likes: 7,541
From: Poolville
You know on an older bike it can be as much as a poor connection somewhere in the ignition circuit.. have you checked all connectors? Jiggle test... I just recently lost all accessory lighting. Circuit breaker was constantly tripping. Found an intermittent short in the harness that was shorting to the rear tank mount....
Thread Starter
|
Intermediate
Joined: Nov 2018
Posts: 33
Likes: 0
From: Leamington, ON, Canada
You know on an older bike it can be as much as a poor connection somewhere in the ignition circuit.. have you checked all connectors? Jiggle test... I just recently lost all accessory lighting. Circuit breaker was constantly tripping. Found an intermittent short in the harness that was shorting to the rear tank mount....
Trending Topics
Elite HDF Member
Joined: Mar 2006
Posts: 3,673
Likes: 606
From:
I had something like happen to my 85. I replaced everything in the ignition....I thought. I was looking thru the schematic and saw the 15 amp ignition circuit breaker was the only thing I didn't replace. I replaced it and my problems stopped. they should be under the speedo/tach head. I think there is 4, 15 amp breakers on your model. I replaced all of mine while I was in there. I got mine at an auto parts store but that was before amazon came along.
HD Forum Stories
The Best of Harley-Davidson for Lifelong Riders
8 Best Harley-Davidson Motorcycles Ever
Pouria Savadkouei
10 Worst Harley-Davidson Motorcycles Ever
Pouria Savadkouei
Killer Custom's Jail Break Is The Breakout That Refused to Blend In
Verdad Gallardo
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?
Verdad Gallardo
Harley-Davidson Reveals Super Cool Cafe Racer Concept
Verdad Gallardo
Engraved Rebellion: Inside Bundnerbike's Glam Rock II
Verdad Gallardo
10 Motorcycles You Should Never Buy
Joe Kucinski
10 Things Harley-Davidson Needs to Fix in 2026
Verdad Gallardo
Southpaw Super Glide: A Left-Hand-Drive 1979 Harley FXE Built to Fit the Rider
Verdad Gallardo
Thread Starter
|
Intermediate
Joined: Nov 2018
Posts: 33
Likes: 0
From: Leamington, ON, Canada
I had something like happen to my 85. I replaced everything in the ignition....I thought. I was looking thru the schematic and saw the 15 amp ignition circuit breaker was the only thing I didn't replace. I replaced it and my problems stopped. they should be under the speedo/tach head. I think there is 4, 15 amp breakers on your model. I replaced all of mine while I was in there. I got mine at an auto parts store but that was before amazon came along.
Thread Starter
|
Intermediate
Joined: Nov 2018
Posts: 33
Likes: 0
From: Leamington, ON, Canada
So my VOES ground was very loose, as in the screw was barely in and the connectors were hanging on the screw but not tight to the frame. Could this be possibly the issue?