I have a 1990 Olds 98 with a charging problem. THe battery is good and the alt is new. It is not charging

THE E-150? , IN WHAT COUNTRY AND WHAT ENGINE CHOICE THERE.
3GAS AND 1 DIESEL.
5.8l?
Leece-Neville Alternator????reg on rear or reg on fire wall/fender.
they use 3 types of ALT then, or more.
i sure can not see any of that to be savvy


THE REGULATOR , SIMPLY IS UNPLUGGED
AHHH YOU MODIFIED THE ALT ,WITH NOT TOLD NEW ALT, UNKNOWN.
TO DO THAT TAKES 2 THINGS
1990 SERVICE MANUAL
AND THE SPEC SHEET ON THE NEW WRONG ALTERNATOR, (THEY ARE ALL DIFFERENT.)
WELL THE BIG LUG IN THE ALT WIRES TO SAME BIG LUG WIRE,(BATTERY NEG LUG PULLED)
WHAT MATTERS IS REAR JACK ON NEW ALT
HOW TO WIRE IT.
most alts (new) have 3pins , one is charge lamp in cluster ,other is ignition on. power.
some are 2pin alt.
the 1990 some had only a dash AMMETER and no Charge IDDioTT lamp
so only one small wire needs to be run from new (secret) alt to the red/LG wired. to fuse link and IGN switch run pin.
some new alts the 2nd pin is needed to be connect to a charge lamp or there is no bootstrap current to wake up the new alt. (this wire is charge lamp)
no new alt told.
if yes, a resistor at 120 ohms 2 watts jumpering
new alt pin IGN to charger lamp pin pair, works.
this resistor simulates the missing charge lamp./
the newer the alt the more likely the resistor is not needed.
the what car new alt came out of and answers go 10x more easy. and exact.

http://www.ehow.com/how_2249402_find-parasitic-battery-drain.html

ran cheery, the exhaust ran red hot? LOL.
the engine runs off the alternator not the battery.
so , if the alt is bad,the battery will discharge.
the alt charge lamp glows, did it?

old post,
bad alt, or battery is no good.
try a known good battery , and make sure the
voltage across the battery is 13.3v to 15vdc running.
if not the ALT System is bad, notice I said system.

btw , replaced means nothing to me.
new , used, rebuilt, recycled, , what?

Check the gauge isn't fautly it might have broke!!! or there might be a louse connection!

Check for a blown fuse, if I remember right Oldsmobile had a charging fuse in those years.

it is the automatic load leveler that pumps air into the back shocks to level the car so it rides better when there are lots of people or weight in it. it is in the frontof the car opposite the battery, just disconnect it. had the same problem on my 1990 olds 98.

Review this Wiring Schematic about Olds 98 ('89, '90 & '91):
1989 1
1989 2

1990 1
1990 2

1991 1
1991 2

I really hope help you with this (remember rated this help). Good luck.

It means that your charging system is in trouble. Possiblity is alternator...or the battery. Go to Schuck's/Kragen/Chief's/NAPA....they will test BOTH for free.

Key switch?
Starter Solenoid?
Starter?
Battery Cables?
All of these need to be checked.
Do and of the lights work?
Put a meter on the battery. Should show 12 to 13 volts
Have someone try to start the car, Does the voltage change?
Yes, you may have a starter problem.
No, you have a switch, cable or solenoid problem

In this year , there may be an external VOLTAGE
REGULATOR .Instead of an internal regulator inside the alternator. It is usually a square box to the passenger side attached to the fender inside wall. Try replacing this box with a known good one. Or new one if you can get it right away.