1990 5.0 lx CHARGING and STARTING ISSUES

jack · November 2nd, 2010, 08:11 PM

I bought my 1990 5.0 lx a little over 2 years ago the car had some engine mods done by the previous owner exchaust headers he put a MSD in and a cold air intake i had the car maybe 6 months and than the issues the car would not and still will not start when the temp is over 180 even after i replaced the starter which i knew was going bad,, i finally replaced thinking all my high temp starting promblems.. NOPE so i thought maybe alterntor .. so i took it out had it tested it was bad so i bought a brand new one not a rebuild.. put it in and still not charging brand new battery brand new starter solnoid iam reading 6 to 8v at the solnoid i have checked a my connections and still nothing the battery in located in the trunk but iam still not getting any reading over 8v at the solnoid
PLEASE HELP iam at wits end the car sounds great it has balls but iam only able to go a few miles from the house and i can not turn it off til i get in back into the garage .. IT SUCKS

ryanw · November 2nd, 2010, 08:38 PM

Do you have a good ground ? Also what size gage wier are you using for positive ? If your running the battery in the back you need a big wier

jack · November 2nd, 2010, 08:43 PM

yes it has a good ground actually grounded in several locations i believe the size of the wire is 4 gauge i didnt install the wire i bought the car that way but i did check all the grounds

ryanw · November 2nd, 2010, 08:45 PM

I could be wrong but i thought i saw on another thread that you should be running a 2 or a 0 gage wier i cant remember wich though.

jack · November 2nd, 2010, 08:50 PM

yea thats what i have been told but like i said iam not getting a thing higher than 8v at the solenoid so i figure the size of the wire going back to the battery at this point shouldnt matter

ryanw · November 2nd, 2010, 08:54 PM

check power at the alt and see what you have. Ive gotton bad alt that were new right out of the box

jack · November 2nd, 2010, 08:58 PM

on which wire should i be checking i know this probably sounds like a stupid question but iam no mechanic i have never had this problem with any vechicle i have had

jack · November 2nd, 2010, 09:11 PM

the reason why iam asking is because this alternator has the push connector on it with 2 black/orange wires and a single white wire

ryanw · November 2nd, 2010, 09:18 PM

http://www.veryuseful.com/mustang/te...nks-ign-ac.gif it looks like its the black/orage wier. maybe you have a bad fues link

November 2nd, 2010, 08:11 PM	#1
jack Newbie 1990 Mustang 5.0 LX Join Date: Nov 2010 Location: Port St Lucie Florida Posts: 5 iTrader: 0 reviews	1990 5.0 lx CHARGING and STARTING ISSUES I bought my 1990 5.0 lx a little over 2 years ago the car had some engine mods done by the previous owner exchaust headers he put a MSD in and a cold air intake i had the car maybe 6 months and than the issues the car would not and still will not start when the temp is over 180 even after i replaced the starter which i knew was going bad,, i finally replaced thinking all my high temp starting promblems.. NOPE so i thought maybe alterntor .. so i took it out had it tested it was bad so i bought a brand new one not a rebuild.. put it in and still not charging brand new battery brand new starter solnoid iam reading 6 to 8v at the solnoid i have checked a my connections and still nothing the battery in located in the trunk but iam still not getting any reading over 8v at the solnoid PLEASE HELP iam at wits end the car sounds great it has balls but iam only able to go a few miles from the house and i can not turn it off til i get in back into the garage .. IT SUCKS

November 2nd, 2010, 08:38 PM	#2
ryanw I Post Entirely Way Too Much 1991 Ford Mustang GT Join Date: May 2007 Location: San Diego, California Posts: 6,063 iTrader: 0 reviews	Do you have a good ground ? Also what size gage wier are you using for positive ? If your running the battery in the back you need a big wier __________________ DART 331ci stroker, AFR 185 heads, Trick Flow R intake, Accufab 70mm tb, 75mm pro m Maf, 30lb injectors, jba headers, 2 1/2" x pipe flowmaster super 10 mufflers, 255 fuel pump, 3:27 gears

November 2nd, 2010, 08:45 PM	#4
ryanw I Post Entirely Way Too Much 1991 Ford Mustang GT Join Date: May 2007 Location: San Diego, California Posts: 6,063 iTrader: 0 reviews	I could be wrong but i thought i saw on another thread that you should be running a 2 or a 0 gage wier i cant remember wich though. __________________ DART 331ci stroker, AFR 185 heads, Trick Flow R intake, Accufab 70mm tb, 75mm pro m Maf, 30lb injectors, jba headers, 2 1/2" x pipe flowmaster super 10 mufflers, 255 fuel pump, 3:27 gears

November 2nd, 2010, 08:54 PM	#6
ryanw I Post Entirely Way Too Much 1991 Ford Mustang GT Join Date: May 2007 Location: San Diego, California Posts: 6,063 iTrader: 0 reviews	check power at the alt and see what you have. Ive gotton bad alt that were new right out of the box __________________ DART 331ci stroker, AFR 185 heads, Trick Flow R intake, Accufab 70mm tb, 75mm pro m Maf, 30lb injectors, jba headers, 2 1/2" x pipe flowmaster super 10 mufflers, 255 fuel pump, 3:27 gears

November 2nd, 2010, 09:18 PM	#9
ryanw I Post Entirely Way Too Much 1991 Ford Mustang GT Join Date: May 2007 Location: San Diego, California Posts: 6,063 iTrader: 0 reviews	http://www.veryuseful.com/mustang/te...nks-ign-ac.gif it looks like its the black/orage wier. maybe you have a bad fues link __________________ DART 331ci stroker, AFR 185 heads, Trick Flow R intake, Accufab 70mm tb, 75mm pro m Maf, 30lb injectors, jba headers, 2 1/2" x pipe flowmaster super 10 mufflers, 255 fuel pump, 3:27 gears

November 2nd, 2010, 08:43 PM	#3
jack Newbie 1990 Mustang 5.0 LX Join Date: Nov 2010 Location: Port St Lucie Florida Posts: 5 iTrader: 0 reviews	yes it has a good ground actually grounded in several locations i believe the size of the wire is 4 gauge i didnt install the wire i bought the car that way but i did check all the grounds

November 2nd, 2010, 08:50 PM	#5
jack Newbie 1990 Mustang 5.0 LX Join Date: Nov 2010 Location: Port St Lucie Florida Posts: 5 iTrader: 0 reviews	yea thats what i have been told but like i said iam not getting a thing higher than 8v at the solenoid so i figure the size of the wire going back to the battery at this point shouldnt matter

November 2nd, 2010, 08:58 PM	#7
jack Newbie 1990 Mustang 5.0 LX Join Date: Nov 2010 Location: Port St Lucie Florida Posts: 5 iTrader: 0 reviews	on which wire should i be checking i know this probably sounds like a stupid question but iam no mechanic i have never had this problem with any vechicle i have had

November 2nd, 2010, 09:11 PM	#8
jack Newbie 1990 Mustang 5.0 LX Join Date: Nov 2010 Location: Port St Lucie Florida Posts: 5 iTrader: 0 reviews	the reason why iam asking is because this alternator has the push connector on it with 2 black/orange wires and a single white wire

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