System Check - Electronic Synchronizer

Electronic Synchronizer System Check

1. Place the ignition switch in the RUN position, with 4WD engaged. It may be necessary to rotate the front tires slightly for the front axle to fully engage.
2. Electronic synchronizer connector at the transfer case. Connect a test lamp from the wiring harness red wire connector ground. The test lamp should tight.
3. If the test lamp does not light, check the circuit for opens. If none are found, replace the relay as outlined later.
4. If the test lamp lights in step 2, check the synchronizer coil for continuity. If the coil is open, replace it as outlined in the proper unit repair manual. If the synchronizer coil has continuity, it is probably OK. Recheck fluid levels, linkage adjustments, etc. before presuming the synchronizer to be faulty.