Jake's 4L80e D3
 

Hello all, new here. I have a Jakes's transmission with D3 brake. Been searching for sometime and don't see what I'm looking for. Anyone know how much current the transbrake circuit draws?

Thanks

Less than 2.5 amps for the standard D3
D3 pro uses a larger solenoid that pulls less than 5
Either way, protect the circuit with a fuse. Use a solid state relay if you plan to bump

I never recommend an ECU trigger be sent directly to a transbrake solenoid. If using an ECU output, always use a relay

Great, I thank you. Was wanting to be sure I used the correct size fuse. If over-fused wouldn't help in a melt-down/current over-draw. I've read on some forums where some trans brakes pull in excess of 10 amp which I thought was a lot for pulling in a solenoid.

By the way, I'm using an MSD solid state relay pack. I don't plan to bump at all. I'm going for an old-school approach, backup brake light circuit (through a relay) to provide reverse during backing up and then a parallel button activation switch for staging/launch. Still on a search for a well designed safety lock-out diagram as this is a street/strip car but worst case, I could use a mechanical spring-loaded switch cover to keep fiddly fingers off the activation button.

Again, thanks for the reply.

Factory or aftermarket ECU? Some pretty trick things you can do with a holley and setting up the safety parameters. Good call on the MSD 4 bank SSR. I have one also those, they are nice! On the stock ECU setup I ran a LED light on my Jakes D3 to tell me when it's on or not, and some relays tied into the microswitches and park neutral safety switch on an aftermarket shifter so that I didn't have to hold the transbrake button in every time I go into reverse. If your worried about hitting the activation button, you just wire a ON/OFF arm switch prior to the transbrake activation button.

I am running a Sniper Xflow but frankly I may not be keeping it much longer. I'm having a lot of reliability issues with it and seriously considering going back to carb setup. I like the microswitches idea. I've got a B&M Quicksilver, I may be able to tie something into the existing switches or possibly add something. Great suggestions...thanks very much!