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05-21-2016, 07:25 PM
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#1
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Montana Master
Join Date: Jul 2006
Location: Pasco
Posts: 986
M.O.C. #5972
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Signal Light Issue
I have a new 3790 (well I got it in October) and my truck is telling me the right signal light is defective and it is blinking (in the truck) twice as fast. Normally that means the light is out. When I have had my wife check lights it has worked normally. This sounds like a loose connection somewhere??
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05-22-2016, 08:33 AM
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#2
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Montana Master
Join Date: Oct 2006
Location: McKinney
Posts: 7,166
M.O.C. #6433
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Does it do that with the trailer disconnected? Or connected?
__________________
Bill & Patricia
Riley, our Golden
2007 3075RL (recently sold, currently without)
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05-22-2016, 02:42 PM
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#3
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Montana Master
Join Date: Feb 2012
Location: Lake Gaston
Posts: 8,773
M.O.C. #12156
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My first step would be to check ground, then wiring, then flasher itself
__________________
Mike and Lorraine
2002 3655 FL, 2005 3650RK
2010 3665RE, 2015 3910FB
F350 crew cab dually 6.7
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05-22-2016, 08:15 PM
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#4
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Montana Master
Join Date: Jul 2006
Location: Pasco
Posts: 986
M.O.C. #5972
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Quote:
quote:Originally posted by BB_TX
Does it do that with the trailer disconnected? Or connected?
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It only does it while connected to the trailer.
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05-23-2016, 02:50 AM
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#5
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Montana Master
Join Date: Sep 2013
Location: Pensacola (mail forward service)
Posts: 3,198
M.O.C. #13740
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Flasher... john
__________________
2012 F350 6.7 L dually, 2013 3800RE with 6 pt leveling, Sumitomo 17.5" load range h tires, Samsung 18 cu ft residential fridge, 8k Morryde I.S. with disc brakes. Full timing since 2012.
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05-23-2016, 09:21 AM
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#6
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Montana Master
Join Date: Nov 2009
Location: Wampum
Posts: 571
M.O.C. #9928
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Could be the wrong flasher installed (though that seems very unlikely, but...... Or defective flasher.
__________________
"What happens at camp stays at camp"
2018 3121RL
2016 Ford F350 SB SRW
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05-23-2016, 10:43 AM
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#7
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Site Team
Join Date: Oct 2005
Location: Carmichael - CA
Posts: 7,364
M.O.C. #4831
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Wouldn't a defective flasher cause the problem for both left and right systems whether the RV was connected or not? Or does the flasher have separate circuits for left and right? As this is a brand new truck it would seem the problem is elsewhere.
I would start at the trailer plug-in at the rear of the truck and check the connections for the right turn wire there, the 4x4 connection box on the pin, and at the taillight. Swap the left and right wires and see if the problem follows the wire or not. As the Montana is still new and under warranty, maybe the dealer can chase it for you.
__________________
Carl (n Susan)
There is more to life than fuel mileage.
2012 Montana 3700RL Big Sky Package towed by a 2015 Ford F350 6.7L PSD 4WD CC LWB
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05-23-2016, 11:38 AM
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#8
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Montana Master
Join Date: Oct 2006
Location: McKinney
Posts: 7,166
M.O.C. #6433
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Did the turn signals ever work correctly and only recently begin this problem?
__________________
Bill & Patricia
Riley, our Golden
2007 3075RL (recently sold, currently without)
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05-23-2016, 09:49 PM
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#9
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Montana Master
Join Date: Mar 2012
Location: Redding
Posts: 1,421
M.O.C. #12339
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Your Ford dealer should be able to run a test on your truck connection. Can at least rule out a truck issue. They were very helpful when I bought the new F450.
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05-23-2016, 11:26 PM
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#10
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Montana Master
Join Date: Mar 2011
Location: Okeechobee
Posts: 2,150
M.O.C. #11206
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Quote:
quote:Originally posted by carl n susan
Wouldn't a defective flasher cause the problem for both left and right systems whether the RV was connected or not? Or does the flasher have separate circuits for left and right? As this is a brand new truck it would seem the problem is elsewhere.
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Hi
Flashers are load sensitive. The flasher used with a trailer tow package is commonly different that one used in say a passenger car. The difference being the ability of the flasher to handle more load. Put the flasher from a passenger car in a HD truck with a trailer attached it will flash at a fast rate and get to hot to handle.
Also a HD flasher that has been subject to an overload like a short to ground will exhibit the same symptoms as a standard flasher that is used with a trailer.
I just repaired this problem on a 1999 Dodge 3500. The problem was a short to ground in the trailer connector installed in the fender well.
Phil P
__________________
2009 Montana 3665RE
2009 Duramax 3500 DRW quad cab
personal web page https:// www.sallyscoffees.com
If you get a page not available then remove the "s" after HTTP
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05-27-2016, 02:47 PM
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#11
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Montana Master
Join Date: Jul 2006
Location: Pasco
Posts: 986
M.O.C. #5972
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Thanks for the input. Let me start with the flasher and also make sure the 7-ways are set up correctly.
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