pgf50

Had an alternator fail yesterday on a 99 f250 superduty diesel, and now after changing it the battery light came on and stays on..Batteries seem fully charged..anyone have some ideas to help me out? read somewhere about a super fuse, but cant find it..would this cause the light to remain on? Should I change-out the batteries and see if that puts the light out...
Help would be appreciated..
Thanks

wwb

Put a voltmeter on the batteries with the truck idling. Should be about 14.5 volts. If not, you aren't charging.

Alternator improperly wired??? Pretty hard to do, but you never know.

The "super fuse" you mentioned.... do you mean the fusible link? Get your multi-meter and check for continuity across it.

FionaThe02PSD

Try disconnecting the batteries and letting them sit for a couple of minutes. This should clear the light.

pgf50

Didn't work..anyone with another idea?

gmaier

mine did the same thing i just took the light out never had any problems

pgf50

Ok...2 alternators and many hours later, the problem was solved...The small orange/blue wire going to the 2 wire terminal plug needs to have constant 12v to make the alternater give out power..If it doesn't, Like mine, the either the #6 10amp fuse in the main fuse cabinet(engine comp) is blown or the wire is broken somewhere.. I traceced the wire to a huge wire loom connector just above the drivers side valve cover and took the connector apart to see if there was 12v on the pin for the orange/ble wire..when I took the bolt off and separated the 2 parts of the connector, low and behold the orange/ble wire under the connector was separated in 2 parts...evidently it had rubbed on the valve cover and finally broke....I spliced a piece of wire in and connected everything up, and sure enough the darn alternator worked, and the battery light went out....Everything is ok now, ..Hope that this info will help someone in the same situation..
Thanks for everyones ideas...especially the tape over the idiot lite..lol