Wire Around ADD Relay
12-29-2016, 08:41 AM
#3
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Here is the problem.
I replaced the Tranny with a used unit. The Front axle would not engage after the swap. Thinking it was an ADD issue, I have checked all ADD components and yesterday, found out that the used tranny does not have the ADD Transfer Pressure Switch in the transfer case like the old tranny did.
I would like to wire around this Transfer Pressure Switch, or lack thereof, as a temporary measure until I can get the old tranny rebuilt and reinstalled.
All other ADD components are working as designed.
Vehicle is a 93 4Runner, 3.0
Can I simply unplug it at the relay or is there something else that needs to be done ?
Thanks for the reply..
I replaced the Tranny with a used unit. The Front axle would not engage after the swap. Thinking it was an ADD issue, I have checked all ADD components and yesterday, found out that the used tranny does not have the ADD Transfer Pressure Switch in the transfer case like the old tranny did.
I would like to wire around this Transfer Pressure Switch, or lack thereof, as a temporary measure until I can get the old tranny rebuilt and reinstalled.
All other ADD components are working as designed.
Vehicle is a 93 4Runner, 3.0
Can I simply unplug it at the relay or is there something else that needs to be done ?
Thanks for the reply..
12-29-2016, 01:16 PM
#4
I see you have no understanding of electrical circuits at this time .
If you look at your schematic you will see that the pressure switch when closed allows the coil ( Electromagnet ) in the ADD relay to be grounded
This moves the contact in the ADD relay .from engaged to disengaged allowing things to lock and unlock
Now when the relay is energized it allows the ADD Solenoid to be open or closed
Which means if you want your 4Wheel drive to be able to engage and disengage or be just be disengaged you need to install a switch coming off pin two of the ADD relay the other side of the switch to ground
If you just ground pin 2 of the ADD relay the ADD will been engaged all the time
Massive Torque Bind if your on dry road
If this is the correct schematic for what your working with
If you look at your schematic you will see that the pressure switch when closed allows the coil ( Electromagnet ) in the ADD relay to be grounded
This moves the contact in the ADD relay .from engaged to disengaged allowing things to lock and unlock
Now when the relay is energized it allows the ADD Solenoid to be open or closed
Which means if you want your 4Wheel drive to be able to engage and disengage or be just be disengaged you need to install a switch coming off pin two of the ADD relay the other side of the switch to ground
If you just ground pin 2 of the ADD relay the ADD will been engaged all the time
Massive Torque Bind if your on dry road
If this is the correct schematic for what your working with
Last edited by wyoming9; 12-29-2016 at 01:31 PM. Reason: Keeping it simple
12-29-2016, 02:13 PM
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Wyoming9, Thanks for the reply.
Would the switch you are referring to be something that is manually activated or can this be automatically activated when you switch into 4wd?
I do understand basic electricity and how it flows, etc. I just wasn't sure how this particular relay operated.
Would the switch you are referring to be something that is manually activated or can this be automatically activated when you switch into 4wd?
I do understand basic electricity and how it flows, etc. I just wasn't sure how this particular relay operated.
