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99 Mack RD686S Stop Light Circuit Diagram

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On 11/1/2022 at 11:38 AM, Joey Mack said:

The brake light pressure switch on an RD, is on the fire wall under the hood.. in the center..  Beware, it is hot all the time regardless of ignition position..  Jojo

I always found it weird that they hid the brake light switch on the outside on the RD’s with an ETECH engine. I can’t remember If the earlier RD’s were like that as well. 

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