I'm getting ready to swapping in a 80' TH-200C trans into my 81' and they are the same trans but when cleaning up the 80' unit and comparing, I realized the wiring plug is different. Further reading has led me to believe 80' was the first year for the TCC wiring and it was vacuum controlled. 81' brought on many changes and one minor one was the computer controlled TCC. Not sure if the plug can be spliced, if both wires are simply the same and/or if the solenoid itself is the same. Wondering if anyone has more knowledge or experience with this.
80' vs 81' TCC Wiring/Plug Differences
- Thread starter PBGBodyFan
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In my collection of EC schematics, the first year that shows a TCC in the wiring schematic is 1983 (this does NOT mean that there was NO TCC before 1983). Rather my guess is that the pre1983 TCC will most likely will be found in the vacuum section (assuming it was controlled by a non-computer controlled vacuum switch).
I have attached a link to a seller on ebay with an ADJUSTABLE vacuuum switch: http://rover.ebay.com/rover/1/711-5...0001&campid=5335822911&icep_item=192359828359
This is the switch that I will likely be using for my TCC fix-up on my 85EC with ECM deleted. My intention is to use the normally-on-brake-switch-power (power shuts off only when brake pedal is depressed) to power a trigger for relay to provide power to TCC. However after running power from normally-on-brake-switch-power tab, I will then run the power to the ADJUSTABLE vacuum switch. The 12V output from the adjustable vacuum switch will then travel to the relay (this output will serve as the relay trigger). As a result, no TCC lockup when: i.) brake is applied; ii.) engine is below say 10" vacuum (which should be about half throttle on my EC) - this setting will definitely need to be tuned to optimum level; iii.) trans does not actuate my third gear switch (located in the valve body).
Hopefully, that helps. If you don't have a good vacuum switch then make sure that you order an adjustable vacuum switch.
PS I don't have any info on the different TCC connectors for various years. However, if you can find a factory manual with complete schematic details for that circuit then the connector part number will usually printed in the schematic as an eight digit number.
I have attached a link to a seller on ebay with an ADJUSTABLE vacuuum switch: http://rover.ebay.com/rover/1/711-5...0001&campid=5335822911&icep_item=192359828359
This is the switch that I will likely be using for my TCC fix-up on my 85EC with ECM deleted. My intention is to use the normally-on-brake-switch-power (power shuts off only when brake pedal is depressed) to power a trigger for relay to provide power to TCC. However after running power from normally-on-brake-switch-power tab, I will then run the power to the ADJUSTABLE vacuum switch. The 12V output from the adjustable vacuum switch will then travel to the relay (this output will serve as the relay trigger). As a result, no TCC lockup when: i.) brake is applied; ii.) engine is below say 10" vacuum (which should be about half throttle on my EC) - this setting will definitely need to be tuned to optimum level; iii.) trans does not actuate my third gear switch (located in the valve body).
Hopefully, that helps. If you don't have a good vacuum switch then make sure that you order an adjustable vacuum switch.
PS I don't have any info on the different TCC connectors for various years. However, if you can find a factory manual with complete schematic details for that circuit then the connector part number will usually printed in the schematic as an eight digit number.
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Thanks for the replies and diagrams.
I worked on it a bit more last night, removed the pan on both trans to compare, still not sure the best way to go forward, the plug can be interchanged but don't plan to disassemble the transmission to get all the way to the solenoid which is way up there. This transmission is a placeholder of sorts, it will probably see 2-3 years of use before I change out the engine/trans for the long term solution (i.e. more power). One option brought to my attention is using a manual lockup switch.
Here are pics of the 80' vs 81' as far as the plug itself and the 80' has a switch mounted in the rear, the 81' doesn't. Cross checking parts, not sure if the solenoid itself is different, Rock Auto shows some more universal types for both applications but some more specific ones show up for 81' that don't show up for 80'.
80':
81'
I worked on it a bit more last night, removed the pan on both trans to compare, still not sure the best way to go forward, the plug can be interchanged but don't plan to disassemble the transmission to get all the way to the solenoid which is way up there. This transmission is a placeholder of sorts, it will probably see 2-3 years of use before I change out the engine/trans for the long term solution (i.e. more power). One option brought to my attention is using a manual lockup switch.
Here are pics of the 80' vs 81' as far as the plug itself and the 80' has a switch mounted in the rear, the 81' doesn't. Cross checking parts, not sure if the solenoid itself is different, Rock Auto shows some more universal types for both applications but some more specific ones show up for 81' that don't show up for 80'.
80':
81'
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