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Jeep Wrangler YJ
YJ General Discussion
95 2.5 Idles Erratically Then Stalls at Operating Temperature
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<blockquote data-quote="Cae08" data-source="post: 434240" data-attributes="member: 20072"><p>So I did what you guys recommended to no avail. The codes don't spit anything out either.</p><p></p><p>However, I have narrowed the field to the Charging Circuit. </p><p></p><p>Note that I have installed an external voltage regulator, but these issues were present before I installed it and the circuit was still connected to the PCM.</p><p></p><p>I found that when I unplug the voltage regulator, which keeps the battery from charging, the issue goes away. </p><p>If I plug in the the regulator, reinserting the alternator into the charging circuit, the issue starts back up. </p><p>I changed the alternator today, and it did not fix the problem, but disconnecting the voltage regulator while the vehicle was running stopped the issue instantly. I found this by accident but have no idea what direction to go. Literally there are 5 wires on this circuit.</p><p></p><p>1. Battery Positive to alternator</p><p>2. Ground to alternator</p><p>3. Ground to regulator</p><p>3. Field positive from alternator to regulator</p><p>4. Field negative from alternator to regulator</p><p></p><p>All of the normal charging circuit components, such as the auto shutdown relay, fuel pump relay, etc..., are all isolated from this circuit.</p><p></p><p>When I disconnect Field Positive, the problem goes away, but the alternator also stops charging the battery. The problem only happens when the engine is at operating temp.</p><p></p><p>I've been in contact with the local Jeep Guru who used to be the shop foreman at a Jeep dealership and he has never seen anything like it. </p><p></p><p>Any advice is much appreciated.</p></blockquote><p></p>
[QUOTE="Cae08, post: 434240, member: 20072"] So I did what you guys recommended to no avail. The codes don't spit anything out either. However, I have narrowed the field to the Charging Circuit. Note that I have installed an external voltage regulator, but these issues were present before I installed it and the circuit was still connected to the PCM. I found that when I unplug the voltage regulator, which keeps the battery from charging, the issue goes away. If I plug in the the regulator, reinserting the alternator into the charging circuit, the issue starts back up. I changed the alternator today, and it did not fix the problem, but disconnecting the voltage regulator while the vehicle was running stopped the issue instantly. I found this by accident but have no idea what direction to go. Literally there are 5 wires on this circuit. 1. Battery Positive to alternator 2. Ground to alternator 3. Ground to regulator 3. Field positive from alternator to regulator 4. Field negative from alternator to regulator All of the normal charging circuit components, such as the auto shutdown relay, fuel pump relay, etc..., are all isolated from this circuit. When I disconnect Field Positive, the problem goes away, but the alternator also stops charging the battery. The problem only happens when the engine is at operating temp. I've been in contact with the local Jeep Guru who used to be the shop foreman at a Jeep dealership and he has never seen anything like it. Any advice is much appreciated. [/QUOTE]
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Jeep Wrangler YJ
YJ General Discussion
95 2.5 Idles Erratically Then Stalls at Operating Temperature
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