So I'm blowing the 7.5A fuse for the indicators, running light, instruments etc on my 94 M900.
The funny thing is it happens really irregularly. Sometimes it'll go a week then blow, and sometimes it'll only last a few seconds. Any idea what it could be? I thought it was one of my indicators, but there was nothing wrong with them.
- I tried the wiggling wires trick but of course nothing blew then.
- Once I saw the right indicator light up before it blew
- Bike was on stand. I disconnected front and rear indicators on the right and it still blew. I turned the bars straight and it didn't blow until I turned the indicators on.
Quote from: Howley on March 16, 2009, 02:01:19 AM
So I'm blowing the 7.5A fuse for the indicators, running light, instruments etc on my 94 M900.
The funny thing is it happens really irregularly. Sometimes it'll go a week then blow, and sometimes it'll only last a few seconds. Any idea what it could be? I thought it was one of my indicators, but there was nothing wrong with them.
- I tried the wiggling wires trick but of course nothing blew then.
- Once I saw the right indicator light up before it blew
- Bike was on stand. I disconnected front and rear indicators on the right and it still blew. I turned the bars straight and it didn't blow until I turned the indicators on.
sounds like you got a broken wire somewhere.
+1 Check the wiring under the seat.
Quote from: Dan on March 16, 2009, 03:56:31 AM
+1 Check the wiring under the seat.
Sometimes the seat will pinch the wires. Once the jacket is worn or cut the frame will cause a short.
The fuse blows with the seat off.
Quote from: Howley on March 16, 2009, 02:01:19 AM
So I'm blowing the 7.5A fuse for the indicators, running light, instruments etc on my 94 M900.
The funny thing is it happens really irregularly. Sometimes it'll go a week then blow, and sometimes it'll only last a few seconds. Any idea what it could be? I thought it was one of my indicators, but there was nothing wrong with them.
- I tried the wiggling wires trick but of course nothing blew then.
- Once I saw the right indicator light up before it blew
- Bike was on stand. I disconnected front and rear indicators on the right and it still blew. I turned the bars straight and it didn't blow until I turned the indicators on.
Does the bike quit?
My 96 did that and it turned out the kill switch wires had gotten pinched in the steering stop. It was the 7.5 amp fuse.
Look for bend points in the wiring as well. I was working on an ATM the other day (it's what I do) and there was a spot on a wiring harness where the safe door had opened and closed so much that the wire wasn't completely broken, but the actual metal inside the insulation had broken due to stress. The only way I found it was because I could hear a solenoid throwing, but unfortunately I don't think you'll have that luxury. Good luck troubleshooting :)
Quote from: ducpainter on March 16, 2009, 05:50:14 AM
Does the bike quit?
My 96 did that and it turned out the kill switch wires had gotten pinched in the steering stop. It was the 7.5 amp fuse.
Nope it runs fine.
Have you tried replacing the blinker relay?
No, it is very old looking. Is there any way to test it?
I would look in the harness coming down from the switch. If that looks good, then the switch itself.
The entire left switch block was replaced 2 years ago!
Ok I got a multimeter across the fuse terminals. Here is what happened today.
For future reference, my sidestand switch is disconnected and all the wiring from the switch is gone.
- Came out in the morning, turned it on, over 7.5A = Blown Fuse.
- Disconnected left switch block, turned it on, no blown fuse.
- Reconnected left switch block, turned it on, blown fuse.
- Put bike up on pit stand, disconnected, opened and inspected left switch block, reassembled left switch block.
- Turned bike on, with tank up, no blown fuse.
- Put tank down, no blown fuse.
- Took bike off pit stand and put it on sidestand. Blown Fuse as soon as weight went onto the side stand.
- Held bike upright, no blown fuse.
- Back on sidestand, blown fuse.
- Disconnected fuel level sensor and put bike back on sidestand, no blown fuse.
- Reconnected sensor and put bike back on sidestand, no blown fuse.
- Bike upright, shook bike around, no blown fuse.
- Bike back on stand, no blown fuse.
I'm a bit suspicious that it is the fuel level sensor and perhaps it stopped shorting when it got saturated with fuel. Anyone got any input?
Same circuit, so, yes the sensor may have an internal short. Easy test is just disconnect it and go for a ride.
Yeah that's what I'm thinking. Any ideas why disconnecting the switch block stopped the short?
I would guess coincidence.
Quote from: Howley on March 21, 2009, 04:05:42 PM
Yeah that's what I'm thinking. Any ideas why disconnecting the switch block stopped the short?
I'd have to check the wiring diagram, but knowing Ducati they probably have the feed running through the switch an then back to the sender.
Ok so the fuel sender does go through the switch block, but I unplugged the sender and it was fine, then I rode it for a bit and it blew. It seems when I'm testing it on the stand it will blow when it's on the stand but not when it's upright, and it'll only do so for a few minutes, at which point it will be fine and only blow when I ride it (usually).
I'm baffled....
Do you have a wiring diagram?
If not would one for a 96 help you?
I have the haynes wiring diagram.
It's annoying because it'll blow consistently for a few minutes then stop. Like I can wiggle every wire in the harness and it won't blow. When it's at that stage I can't try unplugging things because it's never blowing anyway.
Friggen electrons.... [bang]
;D
I reckon! I'm going to scan my wiring diagram and edit out all the bits that are not on the circuit, so I can see what to try.
Damn Italian electrons more like it.
Sorry for jumping in, just ignore me if I'm in the way.
Quote from: Howley on March 21, 2009, 12:04:35 AM
- Took bike off pit stand and put it on sidestand. Blown Fuse as soon as weight went onto the side stand.
- Back on sidestand, blown fuse.
Have you wiggled around the switch housing on the left handlebar with a good fuse installed? Were you actually holding the left grip when these blew? Maybe something is shorting inside (I know you replaced it 2 years ago, but something may be moving in there)
OK Weird Fact.
I get continuity across the terminals for the fuse in question with the fuse out, but only when there is no power through the circuit. This is not normal, no other fuse terminals do it. Any ideas what this means?
I'm also getting continuity between both of the terminals and earth, when the bike is on or off.
This doesn't seem right but I have no ideas what it might be indicating.
Any fuse that is not switched will be hot with the key off. Off hand, I think this will only apply to the main relay fuse. Hot on the other side would have to be a backfeed from something else, I can't imagine what since nothing else is hot with the key off, oh, maybe the ignition switch itself. Pull the main relay and see if terminal 87 is hot. The problem, though, is this does not explain your original foose blowing description [bang] You have a winner here.
Oh, use a circuit breaker of the same rating as the fuse instead of fuses. This will save you time, money, and frustration. An inductive ammeter can also help in locating a short. Run it along the suspected wire. The meter will pulse as the breaker cycles until you get past the short.
Thanks Howie, I'll try it out.