Buzz under dash help!!!! - F-Series & SuperDuty Diesel Forums

airdrew99 · 02-07-2011, 03:28 PM

I have a 2000 F-250 7.3L 4X4 crewcab. I got in my truck this morning and the dome light had been all night. It won't shut off (except when I pull the fuse). The switch doesn't affect it. Also, when all the doors are closed (closed all the way), their is a buzzing noise coming from under the dash. To the best of my knowledge, my truck doesn't have factory keyless/alarm. With key on and with the key not in the ignition at all, both cause the buzz sound and keep the dome lights on. When I pull the fuse for the dome lights, the buzz stops and the lights turn off. Yesterday, I did spray some graphite dry film lube on the driver door latch. Maybe this disrupted something. Has anyone ever experienced this before? Any ideas or advice would be greatly appreciated.

DaveBen · 02-07-2011, 05:45 PM

There is a thumb wheel next to the Light Switch. Turn it a little and you should feel a click. Now try the lights with the doors closed. No idea on the buzz.

Dave

airdrew99 · 02-07-2011, 06:00 PM

DaveBen,
I've turned the thumb wheel and it didn't change anything. I went out to do some troubleshooting, and could not get the noise to stay on long enough to pin point it. The fuse panel inside the truck has the accessory delay relay that was chattering some, but it was not same as what I heard earlier. After messing with it for a few minutes, I could not duplicate the problem at all. So for now, the problem is fixed. The dome light works when it should and the buzz noise is gone.

Drew

JLDickmon · 02-08-2011, 07:31 AM

well, you have the trailer tow and electronic flasher relays below & left of the radio, plus the RPO relays are bolted to the backside of the firewall behind the plenum.. who knows what it was, but if it happens again, that's where they are...

DaveBen · 02-08-2011, 09:00 AM

Sounds like a loose wire some where in there. But where???

Dave

twt · 02-08-2011, 01:00 PM

I had this problem & a buddy put WD-40 in the door switches that turn the dome lite on & solved the problem ???

airdrew99 · 02-08-2011, 01:18 PM

twt,
Is the switch part of the latch mechanism on the aft side of the door?

JLDickmon · 02-08-2011, 07:28 PM

Quote:

Originally Posted by DaveBen

Sounds like a loose wire some where in there. But where???

Dave

on a 2000? the side of the GEM module would be the first place I looked..

JLDickmon · 02-08-2011, 07:31 PM

Quote:

Originally Posted by airdrew99

twt,
Is the switch part of the latch mechanism on the aft side of the door?

that's a big 10-4 good buddy.. door panel takes like five minutes to get off and the switch not that much longer to change..

it's the buzzing noise that's getting me.. but.. if it ain't doing it, no sense chasing it..

Lucky_LaRue · 02-09-2011, 05:08 AM

Check the GEM has gotten wet, I almost bet that is your problem.

02-07-2011, 03:28 PM	#1
airdrew99 Living for Him Join Date: Oct 2008 Location: Oxford, MS Posts: 142 Thanks: 10 Thanked 4 Times in 4 Posts	Buzz under dash help!!!! I have a 2000 F-250 7.3L 4X4 crewcab. I got in my truck this morning and the dome light had been all night. It won't shut off (except when I pull the fuse). The switch doesn't affect it. Also, when all the doors are closed (closed all the way), their is a buzzing noise coming from under the dash. To the best of my knowledge, my truck doesn't have factory keyless/alarm. With key on and with the key not in the ignition at all, both cause the buzz sound and keep the dome lights on. When I pull the fuse for the dome lights, the buzz stops and the lights turn off. Yesterday, I did spray some graphite dry film lube on the driver door latch. Maybe this disrupted something. Has anyone ever experienced this before? Any ideas or advice would be greatly appreciated. __________________ 2000 F-250 Crew Cab, 7.3L Powerstroke, automatic, 4WD (manual transfer case and manual locking hubs)

02-07-2011, 05:45 PM	#2
DaveBen SDD Senior Member Join Date: May 2005 Location: Ukiah, California Posts: 7,869 Thanks: 127 Thanked 506 Times in 489 Posts	There is a thumb wheel next to the Light Switch. Turn it a little and you should feel a click. Now try the lights with the doors closed. No idea on the buzz. Dave __________________ 2004 F-350 Regular cab with 6.0, Torqshift, 4X4, and just about all of the rest of the options. I added Guages, Satellite Radio, Air Horns, and a coolant filter. Bilstein shocks. Battery Desulphater that really works. Installed Jimmi Jammers. Pictures here: http://community.webshots.com/user/dbennett48 Completely Stock. I had a Detroit Diesel 8V92TA in a KW dump truck in 1980. That sucker would put out 425 hp but would never out pull a CAT.

02-07-2011, 06:00 PM	#3
airdrew99 Living for Him Join Date: Oct 2008 Location: Oxford, MS Posts: 142 Thanks: 10 Thanked 4 Times in 4 Posts	DaveBen, I've turned the thumb wheel and it didn't change anything. I went out to do some troubleshooting, and could not get the noise to stay on long enough to pin point it. The fuse panel inside the truck has the accessory delay relay that was chattering some, but it was not same as what I heard earlier. After messing with it for a few minutes, I could not duplicate the problem at all. So for now, the problem is fixed. The dome light works when it should and the buzz noise is gone. Drew __________________ 2000 F-250 Crew Cab, 7.3L Powerstroke, automatic, 4WD (manual transfer case and manual locking hubs)

02-08-2011, 07:31 AM	#4
JLDickmon ursus combibo Join Date: Jun 2006 Location: 49041 Posts: 3,796 Thanks: 37 Thanked 265 Times in 249 Posts View Photos By: JLDickmon	well, you have the trailer tow and electronic flasher relays below & left of the radio, plus the RPO relays are bolted to the backside of the firewall behind the plenum.. who knows what it was, but if it happens again, that's where they are... __________________ John '99 F250 7.3L auto 4wd CC/SB

02-08-2011, 09:00 AM	#5
DaveBen SDD Senior Member Join Date: May 2005 Location: Ukiah, California Posts: 7,869 Thanks: 127 Thanked 506 Times in 489 Posts	Sounds like a loose wire some where in there. But where??? Dave __________________ 2004 F-350 Regular cab with 6.0, Torqshift, 4X4, and just about all of the rest of the options. I added Guages, Satellite Radio, Air Horns, and a coolant filter. Bilstein shocks. Battery Desulphater that really works. Installed Jimmi Jammers. Pictures here: http://community.webshots.com/user/dbennett48 Completely Stock. I had a Detroit Diesel 8V92TA in a KW dump truck in 1980. That sucker would put out 425 hp but would never out pull a CAT.

02-08-2011, 01:00 PM	#6
twt SDD Member Join Date: Aug 2006 Location: Glasgow ,Ky Posts: 110 Thanks: 8 Thanked 2 Times in 2 Posts	I had this problem & a buddy put WD-40 in the door switches that turn the dome lite on & solved the problem ??? __________________ 99 F250 Crew cab, covered short bed, 4x4 ,Banks 6 gun, 4" turbo back, dual fuel reg@ 68, Banks big actuator, 203 stat ,in line fuel filter,in tank mod,DP tuner F-6,8" air filter,htr wtr valve Camper puller & seller

02-08-2011, 01:18 PM	#7
airdrew99 Living for Him Join Date: Oct 2008 Location: Oxford, MS Posts: 142 Thanks: 10 Thanked 4 Times in 4 Posts	twt, Is the switch part of the latch mechanism on the aft side of the door? __________________ 2000 F-250 Crew Cab, 7.3L Powerstroke, automatic, 4WD (manual transfer case and manual locking hubs)

02-09-2011, 05:08 AM	#10
Lucky_LaRue PipeLiner Join Date: Dec 2005 Location: Oregonia, Oh Posts: 7 Thanks: 0 Thanked 0 Times in 0 Posts	Check the GEM has gotten wet, I almost bet that is your problem.

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