Aact 425 ❲OFFICIAL × 2026❳

Set your DMM to Ohms (Ω). Measure resistance between the two small terminals (the coil). A healthy AACT 425 should read between 10 and 30 ohms. An open circuit (OL) indicates a burnt coil. A short (0 ohms) means the coil is fried.

With no power applied, measure resistance between the two large terminals. You should see infinite resistance (OL) – the switch is open. aact 425

Check for burnt terminals or cracked housing. If the solenoid is physically damaged, skip testing and replace it. Set your DMM to Ohms (Ω)