Electrical I: Essential Electrical System Diagnostics


4-day Class (Tuesday-Friday) | Max Available seats: 12

Dedicated classes available— please call for details

COURSE DESCRIPTION: Tailored for technicians who have successfully completed the online Digital Multimeter Basics Certification class, this course delves deep into DC Theory and the Diagnostics of various electrical components on commercial vehicles. Key focus areas include DC Circuit Definitions, Diagnostic Essentials, Fault Definitions, Schematic Reading, Circuit Building, and more. Post-training, technicians will have hands-on experience with a 30-fault exercise, ensuring a robust grasp over testing relays, circuits, schematic interpretation, CAN Bus systems, and more. You must bring your Digital Multimeter. Hotel & lunch are included.

Looking for a more advanced electrical course? Check out Electrical II: Advanced Electrical System Diagnostics.



  • DC Circuit Definition and Analysis
  • Schematic Reading
  • Meter Reading
  • Electronic Systems
  • Circuit Building
  • Circuit faults
  • Multiplexing

Please contact us for a detailed Course Syllabus


  • Diesel Technician Electrical Training class
  • 4-day course | Tues-Thurs 8 am-5 pm | Friday 8 am-12 pm
  • Included hotel stay, lunch, and TRITECH-provided equipment


  • Laptop: Diagnostic laptops will be provided. However, we encourage students to bring their own
  • Safety: Eye & ear protection, safety masks, and gloves will be provided. Steel-toe shoes and long pants required
  • Meals: Lunch and drinks will be provided daily. Additionally, the Hotel provides breakfast every morning from 7 am-9 am
  • Hotel: Hotel room for Student attending training class Monday- Thursday nights

LOCATION: ETT Training Center

TRITECH Expert Technician Training Center is in New Braunfels, TX, while the San Antonio, TX airport (SAT) is 35.5 miles from training center and the Austin, TX airport (AUS) is 47 miles from ETT training center. Please plan on arriving the Monday prior to class starting on Tuesday and departing Fridays 3:00pm or after.


Fairfield Inn & Suites by Marriott

1465 I-35 New Braunfels, TX 78130

What to do while in town?

New Braunfels is Centrally located between Austin and San Antonio and is best known for the Comal and Guadalupe Rivers, great food, live music and the nearby Gruene Historic District.


Please complete 1 Enrollment Form per enrollee to reserve a slot in an upcoming Cummins Engine Training class. Enrollment Forms can be requested by email at ett@tritechent.com or by phone at 830-743-9720. Registrations will be accepted up to the start of class and are subject to available seats. See Cancellation Policy