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  #16 (permalink)  
Old 09-06-2011, 09:35 PM
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Sure..

The manual switch basically bypasses the 4th gear pressure switch. Unlike your set up, this manual switch takes +12 volts which is present when the BRAKE is NOT ON and feeds it to directly to the TCC solenoid. Notice that the blue wire ends on the same 4th gear pressure switch terminal as the TCC solenoid is connected to. This effectively bypass the 4th gear switch. When turned on, the manual switch will therefore force the TCC to lock even when the transmission is NOT in 4th gear.

This is yet another wiring method for towing..because you can force the TCC to lock when you want it to regardless of the 4th gear.

To answer your question, no this would not create teh same short. As it is feeding +12 volts to a device that is expecting it. Secondly even if the 4th gear pressure switch is closed, it is conducting the +12v that has the same voltage source as the manual switch. Therefore regardless of any of these switch conditions, a short to ground cannot occur.

Vic

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Last edited by cadmanof50s; 09-06-2011 at 09:45 PM.
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  #17 (permalink)  
Old 09-07-2011, 07:11 PM
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What would this do?



I'm thinking that the lockup wouldn't engage unless the trans was in 4th AND the switch was tured on. When the lockup is engaged, the LED would come on.
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  #18 (permalink)  
Old 09-07-2011, 08:38 PM
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Firstly the manual switch will activate the 4th lock up. (You don't need the ground lead at the manual switch ..it will do nothing.

The LED will light when the manual switch is active ( i.e. allows the TCC to lock) AND the transmission is in 4th gear.

If any part of that LED circuit shorts out to ground (accidentally) ..you're back to square one. It would create the same condition that we started with...the fuse will start blowing again.

Who built this circuit? That LED will receive full +12 volts. Many common LEDs will fry up unless there is some kind of current limiting device such as a resistor.

At this point I must ask, wouldn't you rather have TCC kick in automatically? Or is there a reason you want it to be engaged manually?


Vic

Last edited by cadmanof50s; 09-07-2011 at 08:48 PM.
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