Alternator Amperage Test Recommended Best Practice Before install of the E-200 it is recommended to get a baseline of the amp draw being consumed by the vehicle. Using an amp clamp on the alternator output wire measure the amp draw: 1. At idle 2. Radio on 3. AC and fans on high 4. Wipers on high 5. Headlights on The E-200 requires an additional 115 amps excess amperage from the alternator. For the example above we measure 60 amps. For best results, this should be available even at idle, at which point the alternator will have approximately 60-75% the rated amperage. Example: Power requirement of 60A draw from the vehicle + 115A draw of the E-200 = 175A.
Using the amp draw as defined above the vehicle uses 60 amps. Available power at idle needs to be 60-75% of the alternators rated amperage/150-187 amps available for an alternator rated at 250 amps. Knowing the E-200 and vehicle needs 175 amps we would want an alternator with at least 250 amps or higher. 8 TK 56881-18-IM-EN