I have a 95 Jeep Grand Cherokee that has a good alternator and a new battery. All of the fuses in the engine are fine with it, yet the car once shut off will turn over twice and then just not start. I think it is the starter but am not sure. Is this the problem or is there something I am overlooking?
I would suggest the starter. The brushes in the starter tend to go bad over time and you may be hitting a dead spot in the starter when cranking it. Another indication that the starter could be a problem would be the engine is cranking over slower.
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I was having the same issue with my 95 GMC. I replaced the battery and alternator. It would start fine at times, at other times it would be sluggish. I finally took the starter off and had it checked. Turns out the starter was bad. When it would get hot, it would act as though the battery was dead. Replaced the starter and it has not acted up again. Have the starter checked. Replace if bad.
First: Are your Battery Cables (inside) and Battery Post nice and shiney? It is amazing how corroded/oxidized cables and post will kill a battery. Get then bright and shiney.
To test the Alternator. Start the Vehicle. You can Jump it if you have to. With the Engine running, disconnect the Negative Cable from the Battery. If the Engine dies, it is a bad alternator.
Was the "new" Alternator new or remanufactured?
Was it the correct alternator inespecially 'amps' for your particular vehicle?
Take the "new" alternator off and have it tested at auto parts store where you bought it.
Any remanufactured alternator may pass the factory inspection but will fail at the auto parts store. Just because it came out of a new box, and looks new, doesn't mean it works new.
Always when buying and part with a "motor" attached to it from an autoparts store, insist that the new one gets bench tested.
If this does not fix the problem:
Are your belts slipping? Worm out, loose or slipping belts will not turn the alternator pulley correctly and draw the battery dead.
Inspect the Red Positive Wire coming off the Alternator back to the battery. Look for any burnt, melted, or shorted areas.
The Battery Starts the vehicle. The Alternator runs the engine and trickle charges the battery.
Let me know if this helped, or if you have addtional information or questions. Feel free to contact me at FixYa.com!
Check for lights on (glovebox etc) put ammeter from either disconnected battery cable to the battery and check draw by pulling one fuse at a time 'till draw disappears or gets substantially lower. Then check items served by that fuse for any problems. Can't just be that it misses you when you are away? Had battery charged and load tested?
Pretty sure the regulator on those is in the computer (I know...really dumb...) There is a way to wire around it using an older style regulator but it will keep the check engine light on and may not pass inspection like that.
have someone else check your alternator with a voltmeter positive probe to the battery pole on backside of alternator. ground probe to a good engine ground. while running you should see at least 12.35 volts.any less it is bad
Sounds like the inline fuse popped. It is located in the wire that comes from the alternator to the battery. The alternator is sending out the juice, but it can't make it to the battery. I sincerely hope that this gets you on the road again. Best wishes and God Bless.