I have a 93 jeep cherokee with the 4.0 auto. It will not charge, the alternator checks good, I put a different computor in it. It is getting battery voltage to the field terminal but still no charging. Any ideas?
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Re: cherokee charging problem
I'm pretty sure that the field is supplied with a controlled current that varies with load current being drawn from the unit meaning that the voltage applied would vary too.
I don't think you are supposed to have 'battery voltage' (~ 12 V) to the field all the time.
That would imply that the field is either open (not conducting) or is not being controlled by the PCM/ECU.
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Run this by me one more time your Post doesn't make sence. Is Battery light on? Is alternator working properly 13 to 14 Volts You Must have a fully charged Battery to test. Get tested at your Local Auto Parts Store after charging
Hello, Take the battery out and have one of the local auto parts store check you battery to see why it wouldn't hold a charge---good possiblity it a dead battery.. It also sound like that you vehicle stop running? These is a good indication that the battery has shorted out. Also, after you have you vehicle running have the alternator checked to see if it charging. It should be putting out about 13.8 to 14.1 DC volt to the battery with respect to ground. In other words, voltage between the + side to the - side of the battery. GB...stewbison
sure!can you charge battery? if won't start charge the battery and take it to nearest autozone or advance auto parts and as long as your check engine light is on,,, they will code read for free, then they will tell you what or where problem is.if not then try this,,,put in fully charged battery,start it,,disconnect the positive cable from battery while engines running,careful not to let the positive cable come in contact with any metal of car, if engine dies,,altenator not charging,may be bad diode in back of the altenator or blown fuseable link inbetween starter and altenator.hope this helps and if so please note so in response. thank you for choosing fixya.com
Code 47 means Battery voltage sense input below target charging voltage during engine operation.
1st Thing i would check is the battery, to make sure it has a full charge and full amount of cold cranking amps and make sure all connection are clean and tight.
2ND If you have a voltmeter check and see if alternator is putting out enough volts should be close to 14.5 volts. If you have no way to check them most auto parts store will check them for free.
If i can help anymore please re post . Thanks dodge tec
Based on what you noted, your system is not drawing too much, it is overcharging. Determine if you have an external regulator in your system (depends on alt. make and alternator design) Many of the Jeep systems have the voltage regulator as an integral part of the main computer. Likely it has failed. Also make sure that the charging system is properly grounded and the battery is fully charged and can undergo a load test without substantial voltage drop. If it cannot, it will over-work the alternator.
Find a friend with a heated garage that you can use first off, then locate the short that may be causing all this. Unless you have a bad battery? If its more than 3 years old, replace it. Batterys are cheap. WALMART has em under 89 bucks for most vehicles.