Question about 1996 Jeep Grand Cherokee
If the charging system is not putting out
the required voltage, is it the alternator or the regulator? Full
fielding the alternator to bypass the regulator should tell you if it is
working correctly. Or, take the alternator to a parts store and have
it bench tested. If the charging voltage goes up when the regulator is
bypassed, the problem is the regulator (or the engine computer in the
case of computer-regulated systems). If there is no change in output
voltage, the alternator is the culprit.
When the engine cranks normally but won't start, you need to check ignition, fuel and compression. Ignition is easy enough to check with a spark tester or by positioning a plug wire near a good ground. No spark? The most likely causes would be a failed ignition module, distributor pickup or crankshaft position (CKP) sensor.
A tool such as an Ignition System Simulator can speed the diagnosis by quickly telling you if the ignition module and coil are capable of producing a spark with a simulated timing input signal. If the simulated signal generates a spark, the problem is a bad distributor pickup or crankshaft position sensor. No spark would point to a bad module or coil. Measuring ignition coil primary and secondary resistance can rule out that component as the culprit.
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Posted on Sep 06, 2010
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Posted on Jan 02, 2017
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