Electrical - Measuring Closed Circuit Current: Overview
SI B 61 08 00General Electrical Systems
May 2005
Technical Service
This Service Information bulletins supersedes S.I. B61 08 00 dated March 2005.
[NEW] designates changes to this revision
SUBJECT
Closed-Circuit Current Measurement
MODEL
All
SITUATION
Increased closed-circuit currents may occur permanently or intermittently, and cause the battery to discharge prematurely. The increase in closed circuit current may be caused by a faulty control unit, or by the installation of a non-approved accessory.
In a situation where a vehicle has broken down due to a discharged battery, for diagnostic purposes it is important not to disconnect the battery. This is because a control unit will be reset if the battery is disconnected. Following a reset, the faulty control unit may start functioning correctly again, making accurate diagnosis impossible.
To correctly measure closed-circuit current, the 50-amp clip-on probe can be used in conjunction with the DISPlus to properly diagnosis closed circuit current problems over an extended period of time. Refer to Service Information B04 07 01 for information about the 50-amp clip-on probe use with the DISPlus. A new 50-amp clip-on probe (refer to SI B04 16 04) can be used with the GT1 in conjunction with the MIB (Measurement Interface Box). Refer to SI B08 02 04 for information about the MIB.
WARRANTY INFORMATION
Information only
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