Im trying to test my alternator circuitry for my 91 Aerostar 3.0. The dammed
fuse link keeps burning out and the haynes book gives some steps on testing.
One of the steps is to touch the "F screw" with the positive of a Voltmeter
while the other on the case. My question is.......where is the "F screw"
located on this alternator? The haynes book gives no loction or picture to
it. There is a threaded female srcrew hole on the back but nothing is
atached to it. Is something supposed to screw into that hole? This
alternator has 2 connectors one for the b+ connectors and the other for 3
other wires. Would appreciate any advice
Yep....large black and orange stripe wire. Ive replaced it with some wire
but that also burns out. Im guessing its a short somewhere. Ive checked some
older threads at google on the topic and one person had a similar problem
back in 2000. He eventually had to change his alternator since it was
shorting within it. (i guess) Now im trying to see if its my alternator
also. But I dont want to go off and spend 40 bucks on a rebuilt one yet till
Im sure it isnt something else.
it runs about 13 to 14 when van idles correctly. However after awhile the
idling lowers down (when not moving)and charging seems to lower to 12.60
when lights are on. But once rpm goes up...... charging increases. Ive had
this problem for about 2 years and instead of buying new fuse links at the
dealer,....Ive simply replaced it with regular wiring (somewhat smaller than
the black & orange striped wire...but then again...so are the fuse links
themselves) However.......over time I have replaced them with thicker wire
so as to last much longer. They seem to slowly burn up and corrode. The
article I spoke of earlier is here.....
So it doesnt go over about 14 volts? Rev it up and try it with the lights,
ac, high blower on/then off too. Sounds like its ok. Maybe your problem is
not making a good connection at your wiring "patch". Clean all your
connections near the battery. You can buy fuseable link wire by the roll if
you want. What size are you putting on it? 16? use a bigger one if need be.
Make sure you get a good connection. If the alt isnt overcharging then test
your battery too. A bad battery will pull too much amperage for the link and
the alt. Do you have any extra electrical stuff on the car?
There is an over current problem. Suspect items are the battery. Battery
connections. Alternator connections. Engine ground. You can check with a volt
meter all you want, it will not show what the current is. The best way to see
what is going on is to look at the voltage drops on the ground side of the
circuits. High resistance can not be seen by an ohm meter.
Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here.
All logos and trade names are the property of their respective owners.