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5.0L (1979-1995) Mustang Technical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.

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Old 03-29-2008, 01:32 PM   #1
Dale 5.0
 
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Default charging system issues

I have a 1988 5.0 coupe. I installed a new battery and had the alternator checked which came back good. The car sat for a few years behind a buy here pay here lot so I don't know the whole story of why it was sitting. Anyways this is my first mustang so where doI start to identify the charging system problem. As of right now the car isn't charging at all.
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Old 03-29-2008, 03:20 PM   #2
crusin92red5.0
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Default RE: charging system issues

check to make sure your battery cables are good and tight. what do you mean its not charging. so the car cranks and then dies. then your alt isn't working properly. need more info
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Old 03-29-2008, 03:49 PM   #3
Dale 5.0
 
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Default RE: charging system issues

The battery cables are new and tight. Once I got the alternator back on I put my meter on the battery and it's not charging at all. If you take the positive cable off the car dies. According to the part store's machine the alternator is charging and the diode is good. I don't exactly know what other information you need. This was late last night so after putting the meter on it and moving plugs back and forth I called it a night since I had to be at the Fire Dept early today.
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Old 03-29-2008, 06:03 PM   #4
1992lx5.0
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Default RE: charging system issues

check the plug on top of the alt see if it looks melted or not, trace the wires, check all your grounds from head to fire wall, batt to block, one could be corroded...and if i remember correctly if your alt is good you can take your postive wire off the batt while the car is running and it sould stay running for a sht period of time...i could be wrong
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Old 03-29-2008, 07:13 PM   #5
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Default RE: charging system issues

Neither plug was burnt however the big plug towards the bottom had some corrosion. So i cleaned the alt plug and the harness plug and put some dielectric grease in it.
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Old 03-29-2008, 07:22 PM   #6
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Default RE: charging system issues

ok thats good to see that, that means theres not a shrt in alt or it was not shorted out, when you car running what is your voltage at on your dash board
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Old 03-29-2008, 07:23 PM   #7
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Default RE: charging system issues

Did that have any affect?? If you are starting just fine it sounds like the grounds are good so you have enough cranking power. I would buy a new alternator anyway even if they did say it was good and you can't find any thing else. There are fusable links in that wiring harness going to the alternator and starter solinoid. They are really thick spots in the wire so they are obvious once you find them.
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Old 03-29-2008, 07:31 PM   #8
Dale 5.0
 
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Default RE: charging system issues

That's one of my other issues my volt guage doesn't work. I've been using a volt meter at the battery. I really just didn't want to get into the fusible links unless I had to. What do you guys think about that bottom plug that had corrosion on it?
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Old 03-29-2008, 07:32 PM   #9
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Default RE: charging system issues

i agree with projectresto83 to buy a new alt, and the fusable links should be on the drivers side under the starter selinoid in that cluster of wires youll see them you can miss them
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Old 03-29-2008, 07:39 PM   #10
Dale 5.0
 
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Default RE: charging system issues

Yea I know exactly where the fussible links are I was just not wanting to go there. I was moving them and all the other plugs/wires trying to get some juice. I guess I'll buy a new alt.What is the 3g?
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Old 03-29-2008, 07:39 PM
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