Mark Marar
Colorado Field Services Manager
I’m dedicated to helping businesses and customers stay powered and protected through expert generator maintenance, service, and support tailored to their specific needs.
Guided by a strong commitment to service excellence and customer satisfaction, I focus on building lasting partnerships through dependable communication, proactive solutions, and responsive support. From preventive maintenance to fast, effective repairs, I work closely with every customer to ensure their systems perform at their best when it matters most.
My approach is built on trust, transparency, and technical excellence. Whether supporting commercial facilities, industrial operations, or mission-critical sites, I take pride in delivering dependable service that minimizes downtime and maximizes peace of mind.











What They’re Saying
Featured Articles
Why Property Managers Must Keep Backup Generators Well-Maintained
Key Takeaways by: Mark Marar | Colorado Field Services Managerappears in: The Colorado Real Estate Jounal – April,…
The Most Common Generator Service Issues We See In the Field
Key Takeaways by: Mark Marar | Colorado Field Services Manager Our field service teams frequently encounter preventable …
Prevent Outage Crises With Power Automations
Key Takeaways by: Mark Marar | Colorado Field Services Manager For property managers, a power outage is more than a nuis…
Addressing Voltage Switch (ATS) Issues in Generator Operation
Key Takeaways by: Mark Marar | Colorado Field Services Manager As 2025 unfolds, Generator Source is seeing more generato…
Generator Field Services
Advanced Upgrades and Custom Solutions
Generator Source goes beyond basic service by offering a wide range of custom generator solutions and upgrades to meet your specific power needs. Our engineers and electricians can reconfigure and modernize your power system, including:

Schedule Service
Whether you need expert generator service, preventative maintenance, or are exploring rental options, we’re here to help.
Send us a message, and our team will get back to you promptly.

Quality Assurance
Our Techs are EGSA Certified
Our certified EGSA technicians deliver exceptional, hands-on expertise that our customers rely on.
Standard Tests
- Battery Voltage (12 or 24 Volt)
- Check Air Filter
- Check Barrel Leads (Insul. Tightness)
- Check Battery Cables
- Check Battery Charger
- Check Block Heater
- Check Coolant (Full & Protected for Temp)
- Check Fan Belts
- Check Fuel Rack
- Check Oil & Condition
- Cold Water Leaks
- Fuel Pumped Out of Tank
- Grease Gen Bearing
- Missing Belts
- Remote Start Connection (Locate, Test & Tag)
- Remove Remote Wires
- Tighten All Term Screws
- Tighten Hose Clamps
- Turn Engine for 2 Full Rounds
- Voltage Check
Load Bank Tests
- Accurate Temperature Gauge Test
- Auto Start Test & Tag Verifications
- Check Temperature with Heat Gun
- Coolant Leaks
- Engine Alternator Test
- Full Rating Tests
- Gauge Adjustment Tests
- Gauge Compliance Tests
- Oil Leaks
- Pre-Alarm Verification
- Shut Down Verification

Find Your Service Area
Still have questions or looking for more information?
Generator Source specializes in low-hour, used, new, and surplus generator sets. We have a wide variety of generator sizes and models to fit any project. We are not a broker, we own what we sell.
Call us today (877-866-6895) or click Contact Us to be connected with one of our experienced sales reps.
We have 350+ generators in stock and ready to ship!






