Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Alternator Regulators - DELCO-REMY Double Contact Regulators: Testing
After temperature is known, voltage settings can be made in relation to temperature. Also remove Heater-A/C fuse to shut off blower.
- Connect voltmeter across battery terminals, with a 1/4 ohm-25 watt fixed resistor in positive lead. Start engine and run for 15 minutes at 1200-1500 RPM. Leave cover in place to establish operating temperature. All accessories and lights must be turned off.
- After a 15 minute warm up cycle, cycle voltage regulator by disconnecting and reconnecting regulator connector. Raise engine speed on 2200 RPM. Regulator should be operating on upper contacts. Voltage reading should be within specifications on voltage chart.
Ambient Temperature Voltage Setting 65 13.9 to 15.0 85 13.8 to 14.8 105 13.7 to 14.6 125 13.5 to 14.4 145 13.4 to 14.2 165 13.2 to 14.0 185 13.1 to 13.9 205 13.0 to 13.8
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
Rather have a pro handle this?
A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.
No obligation. See pricing before you book.