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Author Topic: Update: Brake lights when using Jake Brakes  (Read 749 times)
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1985 Eagle

« on: September 06, 2009, 12:40:33 PM »

This is for a DD6V92TA with an Allison 740 Automatic transmission.

Wiring Jake brakes so as to have brake lights on when Jake's are in engaged.

This is for a 2 stage system:  Switch on dash: OFF- LOW-HIGH
I used the following parts from DelCity: WWW.DelCity.net

2—Relays with/Diodes part #73986  Price $5.72 ea
2—Premade relay wiring harnesses Part #73570 cost $1.50 ea
You could use spade connectors connected directly to the relay and eliminate the wiring harness.

Terminal #85 or White wire is ---Ground

Terminal #30 or Black wire is----Positive or Hot I used the wire from the Buffer switch that is going to the switch on the dash where as it will only be hot when the ignition switch is in the on position.

Terminal #86 or Red wire is------Command I connected one from each relay to one of the wires that go to the Jake's under valve covers.

Terminal #87a or Green wire-----Goes to Brake lights

Terminal #87 or Blue wire--------Extra

The reason I used 2 Relays so as not to activate the High or both sides when I only need one side of the Jake's activated.  “LOW”.

They work only when the Jake's are engaged.  When the RPM’s drop below 1200 the Jake's kick out and the brake lights go off.
Nick Badame Refrig/ACC
1989, MCI 102C3, 8V92T, HT740, 06' conversion FMCA# F-27317-S "Wife- 1969 Italian/German Style"
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Nick & Michelle Badame

« Reply #1 on: September 06, 2009, 06:23:51 PM »

Hi Eagle,

It sounds like you got it exactly how you wanted... 

Good Luck with it

Whatever it takes!-GITIT DONE! 
Commercial Refrigeration- Ice machines- Heating & Air/ Atlantic Custom Coach Inc.
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1985 Eagle

« Reply #2 on: September 07, 2009, 12:21:52 PM »

Nick it works as planned. 

The instructions that I posted should also work for an DD8V92.


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