ELECTRICALTEST PROCEDURES
1. NOTE: Connect the negative test lead to the negative
Testing With The Engine Not Running:
The #1 terminal of the Isolator should read vehicle battery voltage. The #2 terminal should read auxiliary battery voltage. The “A” terminal may read from zero to 13 volts.
Testing With The Engine Running And Alternator Charging:
The #1 and #2 should read regulator setting or less, typically from 13.8 to 14.5 volts. The “A” terminal voltage should read 0.8 to 1 volt higher than the reading of the #1 and #2 terminals.
Testing For 12 Volt Systems:
The “A” post should read approximately 14.8 to 15.5 volts. The #1 and #2 terminal should read 13.8 to 14.5 volts. If the “A” terminal reads 13.8 to 14.2 volts the regulator may be sensing the alternator output rather than the main battery. This situation needs to be corrected for proper charging of batteries.
TESTINGTHE ISOLATOR WITH AN OHMMETER**
**If using a digital ohmmeter, a diode scale MUST be used.
1.Remove all wires from the Isolator.
2.Using a needle movement ohmmeter,
3.Next, hold the BLACK* probe on terminal “A” and with the RED* probe touch terminal #1 and #2. A good Isolator will allow no current flow from “A” to #1 and #2.
4.Hold one probe on the aluminum heatsink, making sure there is contact by scratching through the protective coating. Then touch with the other probe terminals “A”, #1, and #2. A good Isolator will show no current flow.
*NOTE: On some import ohmmeters, the RED and BLACK probes are reversed for these tests.
SKU 93801/93802 For technical questions, please call