Question about 2002 Ford F150 Regular Cab

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Alternator f-150 ford f-150 alt reads 12.6 from alt case to pos side of batt. alt guage on dash shows good charge but batt diagram shows red all the time on dash. have changed two alt ,but same results----batt goes down so truck will not run. put portable jumper on and truck runs fine until used up.

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Replace the link between the alternator and the positive side of the battery. This is a fusable link and sometimes can cause this problem this would be the easy fix and is hard to test

Posted on May 17, 2009

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  • Actually check batt voltage.. 12 -13 V
  • Check Batt cables.. remove them and clean them.
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The alternator is out. The ONLY time your vehicle uses battery power (while the engine is turning) is during start up. After that the alternator runs the car.

With the car running put a volt meter on the alternator. Red lead on the big nut on back side if alt. Black lead on the neg batt cable or a good body ground. Voltage should be around 14.5v DC.
Then still with engine running, red lead to batt postive, black lead to batt neg. Voltage should read the same. 14.5v DC
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1994 E150 van ford no alt power have changed the alt. charged the batt


There is a fuse or fuseable link between the alt and battery, and the alt gets a signal from the key to activate the voltage regulator.
I would check for batt voltage at the alternator and you may need a wiring diagram to check for key voltage.

Jul 02, 2012 | Ford Cars & Trucks

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Battery light stays on all the time on my 1985 E250 ford van, i changed the alternator, changed the voltage regulator changed starter silonoid, and it does not hold a charge after jumping!


u need to chek for batt volts at the pos pole on the bak of alt.should b batt voltage if not then wire from pos pole on back of alternator to battery could be broken,causing no output tobattery. wiggl voltage regulator wires while engine runs an check volts with a voltmeter to see if it jumps to over 13v wen wiggling connector.also chek fuses an fusible links for continuity.

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I got 04 ford focus good battery alternator but no charge also i check fuse box next t the battery and the other inside the car everything is good but my alternator still dont charge


1) check 10A fuse in the batt. juction box (eng. comp.) hot at all times.
2) check the large red battery wire to the alt. for good conn.
3) make sure the alt. is grounded properly
4) gray wire sent from the alt. to the PCM
5) blue wire sent from the PCM to the regulator (alt.)
6) small red wire power frorm the 10A fuse
if all checks out and still not charge replace the alt.

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Ford f150 pickup not charging


the gauge is going bad or a bad connection to the gauge! a sure way to find out is put a meter on the alt. and the battery when the gauge reads low and see what the actual volts are and if there high 13's and low 14vdc then you know the alt. is doing it's job and the gauge is bad! good luck

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1989 Ford F250 pickup- amp meter reads backwards


If you had a dead short when connecting the neg. battery cable, the battery was being installed backwards or you had grounded the alternator + lead somhow.

I suspect whnen you installed the battery, you have burnt all of the diodes out in the alternator and the AMP meter is showing no charge. The AMP meter also could have taken a beating in the reversal.

Check the battery in in correctly first. If not reinstall or get the correct battery. Then check the battery voltage with the engine running. If less then 13.2. Replace the alternator again.

Good Luck

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1 Answer

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Likely you did this already but check fuses in power distribution box near battery (likely two 60a fuses for alt in there). Additionally, was alternator regulator tested or was alt "full fielded" for test. (regulator failure will prevent power made at alt from reaching the battery). Also, check continuity of leads going to alternator to make sure they're OK.

Mar 09, 2009 | 1994 Jeep Cherokee Country

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Charging problem 1991 volvo 240


14.6 means your voltage regulator or diode is suspect Despite having new alternator .Ive cross refrenced your smptoms in the haynes workshop manual and alternator is your only end answer.The haynes test is to start vehicle with multi meter connected across the battery terminals,increase the engine speed until the reading remains steady should be approximately 12 to 13v and no more than 14v.switch on as many accessories as possible(headlights heater blower radio etc)check that the alternator maintains the regulated voltage at around 13 to 14v.If the regulated voltage is not as stated then alternator is to be repaired/replaced.Good luck with it and a happy new year.

Dec 29, 2008 | 1991 Volvo 240

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