Question about 2000 Ford F150 Flareside SuperCab

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Ford f150 4.2 not charging put in new alt and batt

Not charging

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  • Ford Master
  • 5,522 Answers

Fully charge your battery. Some years of Ford F150 had parts which would interrupt any battery drain to preserve the battery. This would include the charging circuit which was see as parasitic.

The Antitheft would also cause problems in the electric circuit.

The newer Alternators are not made to work as well as the old ones. If the new Alternators have to work too hard they will fail from overheating so a bad battery could cause the Alternator to never catch up.

Also go to Autozone.com for a free wiring and fusebox diagram when you register your truck online. Check if there is a inline fuse within the first 30" from the Alternator. Or check for a charging Relauy in the Powerbox diagram.

Posted on Oct 30, 2012

  • mw14660
    mw14660 Oct 30, 2012

    new alt newrged for 3 days on trickle at 2 amps checked power box dist in egine compartment fuse ok

  • fordexpert Oct 31, 2012

    You can get a free charging system test at Autozone, Advance, or Oreilys. Probably better to just carry in the Alternator for a bench test. Get wiring diagram if you want for FREE at autozone.com when you register your truck. Check small plugin wire to Alternator brushes. Sometimes the pin connector slips upside the plug when you push the connector into the Alternator. Some mechanics will push the connector cover up the wire and set the connector pin first, then force the connector cover down the wire to latch.

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Posted on Jan 02, 2017

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I have had a string of bad alternators through my shop lately all made by USA alternator. I would breakdown and get an OEM part in this case. I would also bench test alternator prior to installation

Posted on Nov 03, 2008

stormbrewin
  • 426 Answers

SOURCE: 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.

Posted on Dec 29, 2008

  • 113 Answers

SOURCE: 84 ford F350 6.9 diesel charging system not

look for a fusible link out. You need to check for output on the alternator that you installed. make sure the batteries are fully charged before that, otherwise its not going to read right. start from the source. also, you can disconnect the batteries from the sys and do a continuity check on the wires in the loom, so you can see if current has a path, or if you have an open circuit. hope this helps

Posted on Jul 25, 2009

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