Hello all,
I have a 1989 F-150, Starts fine in the morining.But after running for 45 minutes or more, and I stop it won't start. The starter turns slow, Its almost as if the battery is run down.(after it sits for awhile it starts fine) I've had the battery checked and the alt checked. I changed the starter.What else can I do? Also when A/C is running the gauge on the dash show like 10 to 12 volts of charge. But if you put a meter on the battery,it shows a charge.

Please help.....

 

MMMMM....interesting. Off the top of my head it sounds like a bad starter. Have you checked your timing? If it is too far advanced it will give you the same symptoms.
You also might want to put a volt meter on the battery with her running at idle. It should read around 13.5 volts. You also can check all your connections from the battery to the solenoid down to the starter as well as the grounds.

 

>Hello all,
>I have a 1989 F-150, Starts fine in the morining.But after
>running for 45 minutes or more, and I stop it won't start.
>The starter turns slow, Its almost as if the battery is run
>down.(after it sits for awhile it starts fine) I've had the
>battery checked and the alt checked. I changed the
>starter.What else can I do? Also when A/C is running the
>gauge on the dash show like 10 to 12 volts of charge. But if
>you put a meter on the battery,it shows a charge.
>
>Please help.....


Your cables are more than likely corroded internally. Trace your ground cable from the battery. You'll find that it attaches to the frame right below the battery and then continues on to the upper starter attachment bolt. The length and the fact that the negative/ground cable is open in the middle contributes to an inordinant of resistance that is hard to overcome when the cable gets warm/hot. Routing away from the manifolds/headers is almost impossible the way that they are connected.

I did this with my 87(had the same problem). replace the ground cable with a #2 gauge battery cable 36". Run this directly to the block (or mountunder the alternator) up front. take another cable with the flat end bolt holes on both ends and connect from the block to the frame. make sure all connections are clean and bright. Once connections are made, cover with hi temp grease (a little dab).

If you can find a long enough (72" or so) #2 cable route it back along the frame (inner fender) and then turn straight in toward (90deg) the starter. This will keep the cable away from the header/manifold and out of the direct stream of heat between the block and the manifold. It may sound weird but it works. Never had another problem for 6 years afterward. The guy who has it now has had any problems either (he works for me). I did the same with my '93 also, as soon as I bought it. Tie wrap the cables up to prevent drooping.




:7

Larry

 

>>Hello all,
>>I have a 1989 F-150, Starts fine in the morining.But after
>>running for 45 minutes or more, and I stop it won't start.
>>The starter turns slow, Its almost as if the battery is run
>>down.(after it sits for awhile it starts fine) I've had the
>>battery checked and the alt checked. I changed the
>>starter.What else can I do? Also when A/C is running the
>>gauge on the dash show like 10 to 12 volts of charge. But if
>>you put a meter on the battery,it shows a charge.
>>
>>Please help.....
>
>
>Your cables are more than likely corroded internally. Trace
>your ground cable from the battery. You'll find that it
>attaches to the frame right below the battery and then
>continues on to the upper starter attachment bolt. The
>length and the fact that the negative/ground cable is open
>in the middle contributes to an inordinant of resistance
>that is hard to overcome when the cable gets warm/hot.
>Routing away from the manifolds/headers is almost impossible
>the way that they are connected.
>
>I did this with my 87(had the same problem). replace the
>ground cable with a #2 gauge battery cable 36". Run this
>directly to the block (or mountunder the alternator) up
>front. take another cable with the flat end bolt holes on
>both ends and connect from the block to the frame. make sure
>all connections are clean and bright. Once connections are
>made, cover with hi temp grease (a little dab).
>
>If you can find a long enough (72" or so) #2 cable route it
>back along the frame (inner fender) and then turn straight
>in toward (90deg) the starter. This will keep the cable
>away from the header/manifold and out of the direct stream
>of heat between the block and the manifold. It may sound
>weird but it works. Never had another problem for 6 years
>afterward. The guy who has it now has had any problems
>either (he works for me). I did the same with my '93 also,
>as soon as I bought it. Tie wrap the cables up to prevent
>drooping.
>
>
>
>
>:7
>
>Larry



I replaced the Ground cable with #2. I think it may have help.
But it still isn't charging with the A/C on.
What can I do?