ducati 1198 wiring diagram

Slower than you · June 27th, 2012, 09:32 AM

Before I start pulling tupperware off of the 998, I'll tap the wisdom well here.

The fans are always on. Cold start or when at temperature no difference. Turn the key on and they run. Switch it off and they run for the typical 4 seconds then quit.

widewalker · June 27th, 2012, 12:48 PM

Your thermatic fan switch is closed circuit or your wiring is. The fan switch is stuffed or the fan wiring circuit is going to ground/earth. If it's the switch its a good time to get a low temp one. Disconnect the wires from the switch, remove it and clean it, then connect a multimeter set on resistance to the terminals. If you have resistance, its shot.

Slower than you · June 27th, 2012, 06:52 PM

Thanks for the response wide.

Haven't had the time to get to my duc as I'm knee deep in a K1200LT for tyres and brakes/bleed for a friend and an old Duc 250 Mototrans for another friend.

I looked up Tridon from another thread here and will search an American distributor. As we know, buying a switch from Ducati will cost triple what it should.

Thermo Fan Switches | Tridon

Slower than you · June 29th, 2012, 09:14 AM

Disconnected the thermal switch thinking yeaah,,, this is the prob. Nope, same thing. Key on, fans on.
Fuuuuuuu,,, I'm thinkin ECU now.

widewalker · June 30th, 2012, 08:28 AM

Either that or you have a closed circuit somewhere. If the +ve is shorted to ground or the +ve and -ve wires are touching the fans will always be on.

koolkoreanked · June 30th, 2012, 03:59 PM

Wait if the positive is shorted to ground you get nothing, maybe burnt wires. Not sure how it's wired but if it's ground switched then before the switch you have a short to ground causing the fan to stay on. If its positive switched then you have a short to power somewhere. It must be shorted to another switch that's grounded with the key on or powered with the key on. Can you get access to a short finder?

Edit: grab a multi meter and see if you have a ground on both sides of the switch or power (again I'm not sure how it's wired). Ground switch there should only be ground on one side of where the switch goes and then if you go KOEO (key on engine off) there should still be ground on one side. If you get ground on the other then you know where to search. If it's a positive line look for voltage on both sides.

widewalker · July 1st, 2012, 06:40 AM

Sorry for any confusion I may have caused. It should be wired negative switch. If the wires are touching together anywhere or the switch wires are grounded or the sender is shorted inside it completes the circuit and fans stay on. Cheers.

koolkoreanked · July 1st, 2012, 07:00 AM

No confusion lol I knew what you meant, in fact your last post is short and sweet and still explains the problem lol.

Neo-996 · July 2nd, 2012, 04:39 PM

But your bike in front of the TV during a MotoGp race and the "fan" with be turned off real quick.

Slower than you · July 5th, 2012, 06:03 PM

It's been a few days so here's a sorta non update.

The fans are +12 24/7. Key on or off they see +12 and the ECU controls the ground path to close the circuit. I installed a fused switch in place of the 7.5A fan fuse and have been riding it with one eye on the temp gage. 215 ish and I clicky it on. 200 ish and I un clicky it.

I'll drop it off at the dealer so they can plug in and scan it to $ee what turns up.

It's been waay over 100 degrees with mondo humidity here so bike riding isn't a high priority.

June 27th, 2012, 09:32 AM	#1
Slower than you Senior Member ducatis in the registry: [998] Join Date: Feb 2008 Location: Wisconsin USA under duress Posts: 2,929	Fans on Before I start pulling tupperware off of the 998, I'll tap the wisdom well here. The fans are always on. Cold start or when at temperature no difference. Turn the key on and they run. Switch it off and they run for the typical 4 seconds then quit.

June 30th, 2012, 03:59 PM	#6
koolkoreanked Senior Member ducatis in the registry: [1098 S] Join Date: Mar 2011 Posts: 625	Wait if the positive is shorted to ground you get nothing, maybe burnt wires. Not sure how it's wired but if it's ground switched then before the switch you have a short to ground causing the fan to stay on. If its positive switched then you have a short to power somewhere. It must be shorted to another switch that's grounded with the key on or powered with the key on. Can you get access to a short finder? Edit: grab a multi meter and see if you have a ground on both sides of the switch or power (again I'm not sure how it's wired). Ground switch there should only be ground on one side of where the switch goes and then if you go KOEO (key on engine off) there should still be ground on one side. If you get ground on the other then you know where to search. If it's a positive line look for voltage on both sides. Last edited by koolkoreanked; June 30th, 2012 at 04:04 PM.

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June 27th, 2012, 12:48 PM	#2
widewalker Member ducatis in the registry: [998 S] Join Date: Apr 2012 Posts: 163	Your thermatic fan switch is closed circuit or your wiring is. The fan switch is stuffed or the fan wiring circuit is going to ground/earth. If it's the switch its a good time to get a low temp one. Disconnect the wires from the switch, remove it and clean it, then connect a multimeter set on resistance to the terminals. If you have resistance, its shot.

June 27th, 2012, 06:52 PM	#3
Slower than you Senior Member ducatis in the registry: [998] Join Date: Feb 2008 Location: Wisconsin USA under duress Posts: 2,929	Thanks for the response wide. Haven't had the time to get to my duc as I'm knee deep in a K1200LT for tyres and brakes/bleed for a friend and an old Duc 250 Mototrans for another friend. I looked up Tridon from another thread here and will search an American distributor. As we know, buying a switch from Ducati will cost triple what it should. Thermo Fan Switches \| Tridon

June 29th, 2012, 09:14 AM	#4
Slower than you Senior Member ducatis in the registry: [998] Join Date: Feb 2008 Location: Wisconsin USA under duress Posts: 2,929	Disconnected the thermal switch thinking yeaah,,, this is the prob. Nope, same thing. Key on, fans on. Fuuuuuuu,,, I'm thinkin ECU now.

June 30th, 2012, 08:28 AM	#5
widewalker Member ducatis in the registry: [998 S] Join Date: Apr 2012 Posts: 163	Either that or you have a closed circuit somewhere. If the +ve is shorted to ground or the +ve and -ve wires are touching the fans will always be on.

July 1st, 2012, 06:40 AM	#7
widewalker Member ducatis in the registry: [998 S] Join Date: Apr 2012 Posts: 163	Sorry for any confusion I may have caused. It should be wired negative switch. If the wires are touching together anywhere or the switch wires are grounded or the sender is shorted inside it completes the circuit and fans stay on. Cheers.

July 1st, 2012, 07:00 AM	#8
koolkoreanked Senior Member ducatis in the registry: [1098 S] Join Date: Mar 2011 Posts: 625	No confusion lol I knew what you meant, in fact your last post is short and sweet and still explains the problem lol.

July 2nd, 2012, 04:39 PM	#9
Neo-996 Senior Member ducatis in the registry: [996] Join Date: Apr 2009 Location: Zion Posts: 923	*But your bike in front of the TV during a MotoGp race and the "fan" with be turned off real quick.*

July 5th, 2012, 06:03 PM	#10
Slower than you Senior Member ducatis in the registry: [998] Join Date: Feb 2008 Location: Wisconsin USA under duress Posts: 2,929	It's been a few days so here's a sorta non update. The fans are +12 24/7. Key on or off they see +12 and the ECU controls the ground path to close the circuit. I installed a fused switch in place of the 7.5A fan fuse and have been riding it with one eye on the temp gage. 215 ish and I clicky it on. 200 ish and I un clicky it. I'll drop it off at the dealer so they can plug in and scan it to $ee what turns up. It's been waay over 100 degrees with mondo humidity here so bike riding isn't a high priority.