Readins Between 40 Mv And 100 Mv; Readings Above 100 Mv - DigiCore Technology Ctrack iS100 Series II Installation Manual

Always measure for the ripple at the connector end of the power source.
Put the test leads across the positive and negative source and note the reading. The measurement
must be done through the various RPM ranges, i.e. idle, above 2000 RPM at max.
Readings 40mV and below are normally acceptable. Readings above 40mV may indicate the
following problems on the vehicles' electrical system.
9.3.1.

Readins between 40 mv and 100 mv

Check the connection between battery negative and the chassis. Clean or replace corroded
terminals on the battery and the terminal connections to the chassis. If the terminals are visually
clean, remove the terminals and inspect the poles and battery clamps, clean the terminals
anyway. Sometimes a thin film of corrosion may have formed around the poles that cannot be
seen.
9.3.2.

Readings above 100 mV

You may have a battery that cannot hold a charge any longer. The rectifier diodes or regulator
in the alternator may be faulty. Faulty electrical accessories in the vehicle may be inducing
noise in the supply line e.g. clamping diodes across a relay coil that may be blown.
NOTE: The most common and complicated problems with OBC's can be attributed to bad
grounds and noisy electrical systems. Using an accurate DMM and following the test
procedures mentioned above can easily diagnose most mysterious problems experienced on
OBC's.
Revision: 02 05 December 2012
DigiCore Technology (Pty) Ltd
P.O. Box 68270, Highveld Park 0169, South Africa
Ctrack iS100 Series II Installation Manual
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