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- Dodge Ram 2nd Gen Why is 4WD Light Flashing
Guide to diagnose trouble and recommended solutions.
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Flashing 4WD light
#11
10-11-2011 | 11:04 PM
Registered User
Joined: Oct 2011
Posts: 22
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From: Missouri
I was having a similar problem and it ended up being the vacuum switch in the transfer case sticking. It's just screwed into the top of the case and has a big plug with 4 vacuum lines coming out of it. Just pull off this plug and use a 27MM deep socket or wrench to take it out. Be careful you don't break off the nipples or you'll have to get a new one like I did.
It's probably partially or totally stuck in. Take it out and clean it off thoroughly, probably with electrical contact cleaner (others may have better recommendations on cleaners), until it moves freely. If that doesn't work the part isn't very expensive, though most parts houses appear to have to order it (15-20 bucks). Taking it out to clean it is more or less free, though.
It's probably partially or totally stuck in. Take it out and clean it off thoroughly, probably with electrical contact cleaner (others may have better recommendations on cleaners), until it moves freely. If that doesn't work the part isn't very expensive, though most parts houses appear to have to order it (15-20 bucks). Taking it out to clean it is more or less free, though.
Try turning on fan blower to med-hi, (No A/C), and floor it or accelerate hard, if you lose dash airflow, and switches to defroster vents, you have vacuum leak. These 2nd Gen. trucks are bad with the "Evap" leaks as well..Usually at purge solenoid lines, or "charcoal cannister" hoses.
#13
10-12-2011 | 12:18 PM
Registered User
Joined: Oct 2011
Posts: 22
Likes: 0
From: Missouri
#14
10-27-2011 | 02:39 AM
Registered User
Joined: Oct 2011
Posts: 22
Likes: 0
From: Missouri
Hello,
When at a complete stop my 4 wheel drive light is off. When driving it is either flashing very fast or just staying on. The 4 wheel drive is off. When I put the vehicle into 4 wheel drive the light will stay on. Have tried several time putting it in and taking it out of 4 wheel and no go. Any suggestions would be appreciated.
Wade
When at a complete stop my 4 wheel drive light is off. When driving it is either flashing very fast or just staying on. The 4 wheel drive is off. When I put the vehicle into 4 wheel drive the light will stay on. Have tried several time putting it in and taking it out of 4 wheel and no go. Any suggestions would be appreciated.
Wade
If still having issues, the Center Axle Disconnect (CAD) assembly and vacuum ports & Indicator diagram can be found here.
http://dodgeram.org/tech/repair/4X4/cad_mechanism.jpg
#15
10-27-2011 | 02:44 AM
Registered User
Joined: Oct 2011
Posts: 22
Likes: 0
From: Missouri
Hello,
When at a complete stop my 4 wheel drive light is off. When driving it is either flashing very fast or just staying on. The 4 wheel drive is off. When I put the vehicle into 4 wheel drive the light will stay on. Have tried several time putting it in and taking it out of 4 wheel and no go. Any suggestions would be appreciated.
Wade
When at a complete stop my 4 wheel drive light is off. When driving it is either flashing very fast or just staying on. The 4 wheel drive is off. When I put the vehicle into 4 wheel drive the light will stay on. Have tried several time putting it in and taking it out of 4 wheel and no go. Any suggestions would be appreciated.
Wade
If it's of any help, this (CAD) or Center Axle Disconnect assembly can be seen here, with the indicator sensor, and vacuum ports.
http://dodgeram.org/tech/repair/4X4/cad_mechanism.jpg
More than likely the sensor connection may be a little dirty.
If this is the case, I'd clean the contacts up with a wire brush or sandpaper & apply Dialectric Grease between the connection.
#16
10-27-2011 | 12:34 PM
Registered User
Joined: Oct 2011
Posts: 22
Likes: 0
From: Missouri
Here's 1 bad spot on the 2nd Gen/ trucks..
One is RED (Which is wherethe repair I made here is seen).
These lines are on the RH/Passenger side anchored to the transmission crossmember. You can see the O.E.M. piece in my hand, and the 1/8" vacuum hose "Patch" I made. No more Sucky vacuum leak for here anyway..These were common repairs when I used to "Turn Wrenches"..
