⚡ 15–25 Min Sacramento ETA 🚛 Semi-Truck / Class 8 (12V / 24V) 1975–2026 • From $149

Peterbilt Trucks 579 UltraLoft (PACCAR MX-13 / Cummins X15) Jump Start Service Sacramento — Battery, Starter & Boost Specs

24/7 mobile jump start for your Peterbilt Trucks 579 UltraLoft (PACCAR MX-13 / Cummins X15) (1975–2026) in Sacramento using Truck-Mounted 12V/24V Heavy-Duty Gasoline Generator Jump Unit (3,500+ Continuous Cranking Amps).

Model & Years

Peterbilt Trucks 579 UltraLoft (PACCAR MX-13 / Cummins X15) (1975–2026)

Voltage System

12V Class 8 Bank (4x Group 31 Parallel)

OEM Battery Group

4x BCI Group 31 Stud-Post Commercial AGM

Cranking Amps

3,200–4,000 CCA Combined Bank

Alternator Spec

185A–320A Delco Remy 36SI / 40SI Brushless

Starter Motor

Delco Remy 39MT / PACCAR 12V (7.8–9.0 kW)

Peterbilt Trucks 579 UltraLoft (PACCAR MX-13 / Cummins X15) Jump Post Location & Safe Protocol

📍 Step 1: Terminal Location

Battery & Remote Jump Posts

Driver-side step battery box or remote frame jump terminals.

⚠️ Step 2: ECU & Fuse Safety

IBS & Fusible Link Protection

Peterbilt 579, 389, 567, and 379 trucks with PACCAR MX-13, Cummins X15, or CAT C15/3406E engines require 1,800+ cranking amps at 12.6V+ to spin over cold high-compression cylinders without dropping ECU voltage.

⚡ Step 3: Charging Check

Alternator Voltage Test

Post-boost verification of 185A–320A Delco Remy 36SI / 40SI Brushless output (13.8V–14.8V on 12V; 27.6V–28.4V on 24V commercial).

Peterbilt Trucks 579 UltraLoft (PACCAR MX-13 / Cummins X15) Year-by-Year Specifications

Generation	Battery Group	CCA	Alternator	Starter	System Notes
579 UltraLoft (PACCAR MX-13 / Cummins X15) (2021–2026)	4x BCI Group 31 Stud-Post Commercial AGM	3,200–4,000 CCA Combined Bank	185A–320A Delco Remy 36SI / 40SI Brushless (14.2V–14.8V)	Delco Remy 39MT / PACCAR 12V (7.8–9.0 kW)	Smart LIN/BSD Regulated AGM / Aux
579 UltraLoft (PACCAR MX-13 / Cummins X15) (2015–2020)	4x BCI Group 31 Stud-Post Commercial AGM	3,200–4,000 CCA Combined Bank	185A–320A Delco Remy 36SI / 40SI Brushless (14.0V–14.6V)	Delco Remy 39MT / PACCAR 12V (7.8–9.0 kW)	High-Reserve AGM / EFB Start-Stop
579 UltraLoft (PACCAR MX-13 / Cummins X15) (2008–2014)	4x BCI Group 31 Stud-Post Commercial AGM	3,200–4,000 CCA Combined Bank	185A–320A Delco Remy 36SI / 40SI Brushless (13.8V–14.4V)	Delco Remy 39MT / PACCAR 12V (7.8–9.0 kW)	High-CCA AGM / Lead-Acid
579 UltraLoft (PACCAR MX-13 / Cummins X15) (1998–2007)	4x BCI Group 31 Stud-Post Commercial AGM	3,200–4,000 CCA Combined Bank	185A–320A Delco Remy 36SI / 40SI Brushless (13.8V–14.2V)	Delco Remy 39MT / PACCAR 12V (7.8–9.0 kW)	OEM Group Lead-Acid / AGM
579 UltraLoft (PACCAR MX-13 / Cummins X15) (1980–1997)	4x BCI Group 31 Stud-Post Commercial AGM	3,200–4,000 CCA Combined Bank	185A–320A Delco Remy 36SI / 40SI Brushless (13.6V–14.2V)	Delco Remy 39MT / PACCAR 12V (7.8–9.0 kW)	Standard BCI High-CCA