5.0L (1979-1995) MustangTechnical 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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Hey folks hope someone can help here... I have an 88 GT converted to mass air and out of the blue i developed a charging issue...
I have tried 4 alternators to no avail, with car at idle and thru RPM range the battery reads 11.85v and then with the car turned off it reads 12.10 or slightly higher or lower. There is a lil square device on solenoid, is that an external volt regulator?
Anyhelp is appreciated
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Where's the little square device you're talking about? If your cars an '88 then it wont have an external voltage regulator unless someone added one for some reason or another. If your battery is reading 12.10v when the car is off you could clean the terminals and check your battery cables for corrosion wherever they're connected. 11.85v when the car is running isn't bad.
Ok the square box thingie is on the battery side of the solenoid as opposed to the starter side! As for the 11.85, that is with nothing running, my battery will die shortly after turning devices on as the charge is insuffecient.. that is atleat my theory....
one note, i have since cleaned all underhood grounds, cleaned terminals and posts also have aftermarket ground cable and I cut that and provided an oxidation free feed from the ground.... i am at wits end with this problem....
It attaches to the solenoid.If it burns it usually burns in half.Feel the wires coming off the solenoid and see if any feel empty.I will check in a few on my car to see which color it is.
As soon as I know I will post it for you.
I have had to replace mine last time my alternator burned up.In the pics the green wire is the new fusable link I installed it goes down into a black wire that has a square box like looking thing on it that says fusible link.Then it branches off into 2 wires.It looks like the only one that turns into 2 wires if that helps.You can test for power on the soleniod and then on the other side of the black box and see what you got.If you have no power the link is burned out.
Hope this helps.I will be out for a while will check back when I get home.
well keeps gettin better NOT.... anyways, the links on alternator lead seem ok to feel... although one has some noticeable nicks in the coating on the wires. However, there is a draw on this car also and not a parastitic draw... with everything buttoned up usinga voltmeter the reading is equal to batter strength, when i remove 2 wire (excluding alternator lead) the draw does down to .90! One wire i managed to trace back into the cabin on the car... the other is a huge fattie cable that looks pure yellow.
The one that goes to cabin is black and orange -- without that lead the car will not fire although it will crank... one can only assume that controls the spark so likely its going into the computer... the yellow wire and the alt wire i have a draw of approximately 10.57volts!
The black and orange wire does feel as though there are some "hollow / burnt" wires leading to what looks like a special connection. On the backside it read P10R dont know what it is, perhaps a resistor and also a fusible link beneath that and that wire coming from the link also feels very hollow. This wire also gets connected to the solenoid!
I did have a parastitc drain of 0.70 amps and it was associated to fuse #6, removing that brought the drain to 0.00
could this "draw" leave my battery with insuffecient juice getting to it from the alternator?
well the fusible link for the alternator is cooked... wire broken right in half... originally looked like it was a nick in the wire coating NO voltage at all at it thanx mustang8719, will keep you posted on my head ache
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