If you are unfamiliar with the IMS, you may try to remove it—not realizing its many benefits.
Many of the Delco Remy brand starters come equipped with an Integrated Magnetic Switch, or IMS. The IMS provides a higher current draw for the motor. It does this by reducing voltage drop and controlling battery current. This ensures the solenoid receives the maximum available voltage in any starting condition.
If you are unfamiliar with the IMS, you may try to remove it—not realizing its many benefits. However, doing so would result in significant control circuit problems. It will also void your warranty. If an IMS is part of your gear reduction starter, you should never remove, bypass or uninstall it. And if the unit you are replacing has an external magnetic switch, then you have two options:
Option 1
Bypass the external magnetic switch—which is typically mounted on firewall—and connect the ignition wire directly to the starter-supplied IMS.
Option 2
Connect the switch wire that goes to the starter motor solenoid switch terminal and connect it directly to the starter-mounted IMS.
Learn more about the IMS in our most recent tech tip video.