alternator test
Jeep Grand Cherokee Laredo 4x4 3.6 2011
I am diagnosing a no charge situation after major alternator blow up. how can I verify new Alternator is operating correctly, Thanks |
bring it to autozone and have it bench tested
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When my generator was suspect, I tested per the FSM, w/ a carbon pile load, an ammeter and a voltage meter. That testing worked great, as-shown in this topic.
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Originally Posted by 97grand4.0
(Post 3500232)
bring it to autozone and have it bench tested
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Originally Posted by wingless
(Post 3500244)
When my generator was suspect, I tested per the FSM, w/ a carbon pile load, an ammeter and a voltage meter. That testing worked great, as-shown in this topic.
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I must be a simple minded redneck... I just start it up and turn everything on, headlights, A/C on high, stereo cranked, Dome lights on, and see if the headlights are bright white as they should be. Then shut the engine off and see if the headlights dim substantially. If it goes very noticeable from bright white to dim yellow the alternator is working fine. If they are low and yellow with all this on while running and not much change when you shut it off, the alternator is not keeping up. lol
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Originally Posted by luistino
(Post 3500245)
will call see what they say.
LOL Us real rednecks that had distributer and points and a carb would probably put it in and see if it ran the car with the battery unhooked. ( Dont do this!!) |
Originally Posted by 97grand4.0
(Post 3500253)
LOL Us real rednecks that had distributer and points and a carb would probably put it in and see if it ran the car with the battery unhooked. ( Dont do this!!)
"Can I borrow your battery for a minute because I don't have one? Give it right back after I start this" :) |
Hell, I knew a guy who drove his Chevy truck to a fishing spot, unloaded his canoe, took the battery out of the truck, put it on an electric trolling motor on the canoe, fished all day, put it back in the truck, started it and drove home! Now THAT'S a battery!
I also remember with those GM alternators, you could "full field" them by applying 12v to the field winding while the car was running and if the engine slowed down, the alternator was putting out full power. |
Originally Posted by dave1123
(Post 3500269)
Hell, I knew a guy who drove his Chevy truck to a fishing spot, unloaded his canoe, took the battery out of the truck, put it on an electric trolling motor on the canoe, fished all day, put it back in the truck, started it and drove home! Now THAT'S a battery!
I also remember with those GM alternators, you could "full field" them by applying 12v to the field winding while the car was running and if the engine slowed down, the alternator was putting out full power. |
Oh yeah! And adding an electric fuel boost pump because the Quadrajet pulled so much fuel that the float bowl would go dry just about at the top of second gear! One guy I know built a fan hub that would allow the fan to just freewheel if you retracted a pin. That gave you around 20hp right there.
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Originally Posted by dave1123
(Post 3500276)
Oh yeah! And adding an electric fuel boost pump because the Quadrajet pulled so much fuel that the float bowl would go dry just about at the top of second gear!
But now we are getting off topic... lol |
Getting back to the alternator test, I'm with you. Turn the headlights on then start the engine. If everything suddenly gets brighter, the alternator is working.
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Originally Posted by dave1123
(Post 3500281)
Getting back to the alternator test, I'm with you. Turn the headlights on then start the engine. If everything suddenly gets brighter, the alternator is working.
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I see the OP's point, changing out the alternator is no quick task, he wants to make sure he has a good one.
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