Help converter lock up ?
Help converter lock up ? my build 68 camaro ls1/4l60 standalone harness has a wire that says brake switch signal. i have read about needing a special spdt 30 amp relay to unlock converter any one know anything about this ? thanks kevin
Teching In
Joined: Dec 2010
Posts: 28
Likes: 0
I will try to explain the best I can, I did this on my 56 Chevy with transplanted LS1/4L60E. This is a safety thing so that when the converter is locked up and you mash the brake pedal it will unlock thus letting you stop. The relay is nothing special you can purchase on ebay or any auto electric shop, get at least a 40A, I used SPDT 40A-12V which is standard relay. You will be hooking up the relay to work just the oppsite of the brake switch, therefore when you apply pressure to the brake peddle you energize the relay and remove 12Volts from the ECM. Relay spades will be labeled #85, #86, #87, #87A, #30. Connect #85 to brake light side of the brake switch (cold side), #86 to ground, #87A to the ECM (converter lockup), #30 to 12V ignition, #87 is not used. good luck
TECH Fanatic
Joined: Jun 2007
Posts: 1,255
Likes: 11
From: centerville, ohio
Just as conv55 says, it is simple but needed. Search,, Sallee 4l60,, and go to the bottom of the instructions.
