Charging problem - Mustang Evolution

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Old 01-21-2014, 10:31 PM   #1
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Charging problem

I have a 91 5.0 and I've been having charging problems I can't seem to track the problem down i bought a new battery and a new alternator but its still its still wont charge the alternator is brand new and won't pull a magnetic pull on just like the old one, Any ideas?
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Old 01-21-2014, 10:42 PM   #2
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Check and clean all your grounds. Good place to start
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Old 01-22-2014, 05:52 PM   #3
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I cleaned all my grounds and its still not charging
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Old 01-23-2014, 08:54 PM   #4
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Possible relay sticking.may take battery and altonator somewhere and have it checked for your sanity 😁.even tho it's new not sure how long it set on shelf before you bought it
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Old 01-24-2014, 07:41 AM   #5
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We're would the relay be in need to check?
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Old 01-24-2014, 09:30 AM   #6
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Old 01-24-2014, 09:32 AM   #7
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Also started solonoid/relay,hope it helps
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Old 01-24-2014, 09:08 PM   #8
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Check solenoid.
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Old 01-25-2014, 01:38 PM   #9
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Ok I'll check those thanks guys!
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Old 01-25-2014, 02:08 PM   #10
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Ok I'll check those thanks guys!
Since your car is a 91 the Fuel Pump Relay would be under the drivers seat and not in the engine bay, The 92 and 93 had the Fuel Pump Relay in the engine bay.

Also check to make sure the solenoid is anchored tight to the inner fender.
If the solenoid isn't making good contact since the back of the solenoid is metal and the ground for the solenoid, so you want it screwed tight to the inner fender.
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Old 02-19-2014, 07:57 PM   #11
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Sorry guys for the late reply my phone broke and took me a while to get another but I still haven't figured out the charging problem it still won't charge and just runs off the bat until it becomes depleted
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Old 02-20-2014, 02:25 AM   #12
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Did you have the alternator tested?
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Old 02-23-2014, 07:21 PM   #13
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Yea and baught a brand new one too and then had it tested I read somewhere you have to trickle the alternator when you crank it but I took a test light and its not getting power to the alt
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Old 02-23-2014, 08:44 PM   #14
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Could it be a fusible link. Not shure if older mustangs used them but I know they can cause problems like what your experiencing.
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Old 02-26-2014, 06:22 PM   #15
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Do you know where they might be located, there's two plugs kinda underneath the solenoid ones blue and ones black are those fusable links?
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Old 02-26-2014, 07:44 PM   #16
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Did you replace the alternator plug. Most new ford alternators for those year models come with one. I definitely would check there, its common for them to melt or breakdown on the foxbodies.
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Old 02-26-2014, 07:45 PM   #17
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You can find the fusible links in the wire harness cover by tape.
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Old 02-26-2014, 08:55 PM   #18
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You should be able to check all wires with your test light to find out which are not getting power. Start from battery check each wire one at a time between the different components of the system, until you find where it terminates. If you can hear your solenoid clicking when you switch the key on you are good...if no click, bad...unless it is an intermittent problem. That's why I say start at battery, make sure power is getting through entire system.
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Old 02-27-2014, 09:04 PM   #19
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Did you replace the alternator plug. Most new ford alternators for those year models come with one. I definitely would check there, its common for them to melt or breakdown on the foxbodies.
I didn't replace the alt plug but the stock on Is still in good shape
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Old 02-27-2014, 09:06 PM   #20
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You should be able to check all wires with your test light to find out which are not getting power. Start from battery check each wire one at a time between the different components of the system, until you find where it terminates. If you can hear your solenoid clicking when you switch the key on you are good...if no click, bad...unless it is an intermittent problem. That's why I say start at battery, make sure power is getting through entire system.
Yea tomorrow ill go after it with a test light and try and find we're its losing power and thanks almost stock for the diagram it should help me alot
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