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1998dodge ram 5.9 litter magmum 4x4vacum switch

Where is switch for 4x4 activation located

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On chevys, these are hidden under the battery and emmissions vacuum canister. On yours, check your shop manual, or ask parts store best clerk to show you his parts locator chart.

Posted on Jan 01, 2015

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Posted on Jan 02, 2017

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1 Answer

1998 dodge 4x4 activator vacum switch where is it located


The activator switch that engages the front axle is located on top of the axle on the right side of the Axle it will have 2 vacuum lines that plug into it usually they are red

Mar 23, 2014 | 1998 Dodge Ram 1500 4WD

1 Answer

4x4 vacum switch


On the top of the transfer case

Mar 23, 2014 | 1998 Dodge Ram 1500 4WD

1 Answer

07 dodge ram 3500. Cold out and stuck in 4x4. Light in truck stays on (4x4) with switch in 2 wheel. When turned back to 4x4 then try to switch back into 2 wheel like flashes then stays on? What could be...


Likely transfer case switch or solenoid. Typically located on transfer case, is subjected to grime and salt from road causing a malfunction. Local parts store should carry & be under $30. Good luck!

Nov 19, 2013 | Cars & Trucks

1 Answer

No reverse lights


There is a switch (probably mounted on the transmission) the is depressed or released when the shifter is moved to "Reverse". Either the switch has failed or the two-wire connector is broken/corroded. Crawl under and see if you can locate it. If you live in a northern/mountainous area, road salt wreaks havoc on many things exposed to the elements...this could be one.

Sep 26, 2013 | Dodge Ram 1500 Cars & Trucks

1 Answer

4wheel drive will not engage


There are three main things that could cause this. #1: in the passenger side kick panel is a module that controls the 4x4 and it should be clicking as you try to put it in 4x4.#2:There is a vacume activator switch on the transfer case located on the top on the drivers side.(If the module is clicking and trying to put it in 4x4 then I would just go to this activator switch).#3 If you replace the switch and it still dosn't go in to 4x4 there is a vacum diaphram under the battery tray that pulls the front end into 4x4.Check and make sure that there is vacum getting to the diaphram which is controled by the activator on the transfer case.If no vacume at the activator or diaphram check all the vacume hoses going into and out of the activator.If no vacume while vehicle is running suspect bad vacume line.You will need to remove the battery to test the diaphram under the battery tray.You will need to hook up some kind of battery to the cables with the battery out of the car to get it started in order to check for vacume at the diaphram.

Feb 06, 2010 | 2000 Chevrolet Blazer

2 Answers

4wd does not work


Electronic Shift On the Fly (ESOF) Operation
The ESOF system is an electronic shift 4x4 system that allows the operator to choose between two different 4x4 modes as well as 2-wheel drive. The operator can switch between 2WD and 4WD HIGH mode at speed. To engage or disengage LOW Range, the vehicle speed must be less than 5 kph, the brake depressed, and the transmission must be in NEUTRAL.

The transfer case is equipped with an electromagnetic clutch which is located inside the case. This clutch is used to spin up the front drive-line when shifting from 2WD to 4x4 High mode at speed. When the control switch on the instrument panel is turned, the generic electronic module (GEM) recognizes that a shift has been requested and activates the electromagnetic clutch and the relays which power the transfer case shift motor. When the shift motor reaches the desired position as determined by the contact plate position inputs to the GEM, power to the shift relays and motors will be removed. When the transfer case front and rear output shafts are synchronized, the spring loaded lockup collar mechanically engages the main-shaft hub to the drive sprocket. Finally, the front axle collar is engaged and the electromagnetic clutch is deactivated.

Shift Between 2WD and 4x4 HIGH:
Shifts between 2WD and 4x4 HIGH can be made at speed. Listed below are the inputs and outputs needed by the GEM to execute a change between any of these modes.

Feature Inputs:
*4WD Mode Switch (Various resistances).
*Contact Plate Position Inputs A, B, C, D (grounded when closed, open circuit when open).

Feature Outputs:
*4x4 Shift Motor Relay Outputs
*Transfer Case Clutch Relay (grounded when relay is on, open circuit when relay is off).
*4x2/4x4 Vacuum Solenoid (grounded when activated, open circuit when deactivated).
*Cluster Indicators (ground when activated, open circuit when deactivated).

Shifting Into/Out of 4WD LOW:
When shifting into or out of 4WD LOW, the GEM requires that the vehicle speed be less than 5 kph, the brake is applied, and the transmission is in NEUTRAL.

Feature Inputs:
*4WD Mode Switch (Various resistances).
*Contact Plate Position Inputs A, B, C, D (grounded when closed, open circuit when open).
*VSS Sensor (Sinusoid Signal: 0.7V-20V, 2.2 Hz/mph).
Brake Input (battery voltage when brake is depress, open circuit when not activated).
*Transmission Range Sensor (grounded when transmission is in NEUTRAL, open circuit otherwise).
8Start/Clutch Depressed Input

Feature Outputs:
*4x4 Shift Motor Relay Outputs
*4x2/4x4 Vacuum Solenoid (grounded when activated, open circuit when deactivated).
*Cluster Indicators (grounded when activated, open circuit when deactivated).

4WD Mode Switch
A rotary switch allows the vehicle operator to choose between 2WD, 4WD HIGH, and 4WD LOW modes of 4x4 operation.

GEM Module
The Generic Electronic Module (GEM) controls the operation of the 4x4 system

Vehicle Speed Sensor
The vehicle speed sensor (VSS), mounted in the rear of the transfer case, informs the GEM of the vehicle speed.

Transfer Case Shift Motor Sense Plates

The shift motor sense plate, an integral part of the electric shift motor, informs the GEM to the positions of the transfer case

Transmission Range Sensor
Located on the left side of the transmission, this sensor informs the GEM when the transmission is in the NEUTRAL position.

Electric Shift Motor
The electric shift motor, mounted externally at the rear of the transfer case, drives a rotary cam which moves the mode fork and range fork within the transfer case to select between the 2WD, 4WD HIGH, and 4WD LOW positions.

4x4/4x2 Vacuum Solenoids
These two solenoids are attached to the upper RH side of the engine compartment dash, and alternately route vacuum to the vacuum motor which engages/disengages the center axle disconnect collar in the front axle assembly.

4x4 Shift Motor Relay
A module containing two relays which under the control of the GEM, shift the transfer case shift motor between the 2WD, 4WD HIGH, and 4WD LOW modes.

Transfer Case Clutch Relay
An electromechanical relay is used to activate the transfer case clutch within the transfer case.

Good luck and hope this helps,but start with the simple and check the fuses and wire harness. Both white/light blue stripe wires should have 12V in run. The GEM will ground the left side (closest to engine) solenoid to disengage the front axle. It will ground the the right side solenoid (closest to fender) to engage the front axle. If the GEM doesn't see Neutral it will not let the truck come out of 4Lo. If the GEM had water leaking on it it may well be the root of the problem. The shift motor only has power when the GEM sends it a signal to move the shift lever. Once the shift is completed the motor shuts off. There are 2 wires that control the shift motor. A yellow and an orange. The GEM alternates between 12v and Ground to these wires to control which way the motor turns. The GEM uses the transfer case shift relay module to control the power to the motor. There are contact plates inside the shift motor assembly that indicate the position that the shift lever is in. This is what the GEM used to know what the T-case is doing. Any one of these components can fail.







Jan 10, 2010 | 2002 Ford Explorer

1 Answer

I HAVE A 93 S15 JIMMY 4X4. NO POWER TO 4X4 SWITCH


Try pulling the 5 amp fuse on the fuse box under the drivers side of dash that says tccm (transfer case control module) for 2 1/2 minutes, replace the fuse after 2 1/2 minutes then cycle the switch on and off without starting the engine 5 times. This resets the module.

Dec 06, 2009 | 1993 Chevrolet S-10 Blazer

2 Answers

I have a 4x4 1999 dodge ram the 4x4 work great but the 4x4 light whon go out


the 4x4 switch is located on the front axle in a vacume operated pod near the passenger side. the main cause of the light staying on is a vacume leak .check the lines for cracks or something could have knocked them off. follow the lines from the axle to the trans to make shure

Apr 03, 2009 | 1999 Dodge Ram

1 Answer

Wheere is the backup light switch on a 1998dodge pu


Hi my name is Allen!

The backup switch is located on the side of the trans next to the shift lever!

Jan 15, 2009 | 1998 Dodge Ram 1500 4WD

3 Answers

Stalling


YOU MORE THAN LIKELY HAVE IT FIXED BY NOW BUT IT'S YOUR SPEED SENSOR. SAME THING HAPPENED TO MY 99 5 SPEED. ONCE IT WAS REPLACED IT RAN LIKE A CHAMP.

Sep 02, 2008 | 1999 Dodge Ram

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