Question about 1990 Lexus LS 400

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Charging system not working

Tested alternator;changed serpanine belt and checked direction;fusible link ok

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What output did you get from the alternator ?is your battery light on when you turn ign on ?

Posted on Dec 29, 2008

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2 Answers

Battery not charging new alternator still not charging


Did you check power an grounds at the alternator ? The heavy gage wire on the back of the alternator should have B+ voltage , if not fusible link is blown . The connector ,pin's 1 & 3 should have B+ voltage also . There are videos on youtube on checking charging systems . Do you know how to do automotive electrical testing ? How to use a DVOM - digital volt ohm meter ?
How to Test an Alternator Diagnose Charging Issues

Apr 22, 2017 | Cars & Trucks

1 Answer

My 1998 ford windstar hasnt ran for awhile. i got the altenator tested and replaced the battery, checked the fuses in the fuse panel, tested the relays and she still has a problem keeping battery charged...


Check the fusible link between the alternator thick red wire and positive terminal of the battery with the battery disconnected. If that's OK, compare the non-running battery voltage to the running battery voltage and see that it is about 12.7 volts not running and 13.7 to 14 volts running. If you don't see the higher voltages when the engine is running, your alternator is not producing the required charging voltage. At that point you need to determine if you are getting the field voltage to the alternator rotor which is the smaller wires on the alternator. The voltage will vary with the charging demand and electrical load on the system. These voltages come from the engine control module. The belt is turning the alternator, right!

Jan 23, 2016 | Ford Cars & Trucks

4 Answers

Alternator working and charging, warning light says it is not


Go to Autozone,they will check your battery and alternator for free,takes just a few minutes.

Nov 28, 2012 | 2004 Chevrolet Silverado 1500

1 Answer

Brand new battery and alternator but the alternator won't charge the battery, why?


two possibilities that immediately come to my mind from past experience:

(1) check that 2-connector plug on the side of the alternator! if that is disconnected, or not connected tightly, the alternator will not work until the engine is revved up to about 3000. once the engine hits 3000 RPMs the alternator energizes itself and begins to charge.

(2) check the fusible links. they're in a small compartment next to the battery. I remember something about this happening to mine and it was a fusible link. there are 4 of them, the main one says "ALT NAT/BATTERY" and the next one says "IGN SW"... check those two. I'm willing to bet it's that fusible link. I remember that the car started ok but nothing else electric worked. furthermore, with that fusible link broken, the charge indicator (battery) light came on very dim when the ignition switch was off. did you accidentally short something when you did the alternator? I bet this is what's causing that.

Jul 06, 2011 | 1987 Nissan Maxima

1 Answer

Battery not charging. had charging system tested. all okay except alternator. removed alternator and had tested. replaced alternator. system still not charging.


Check the connections and the fusible link. A fusible link is an inline fuse in the wiring. You will need a multimeter to test and troubleshoot. Check that when the ignition is on, that you are getting 12 volts to the lead to the alternator. The ignition switch controls turning on the charging system.

Good luck, jim

May 01, 2011 | 2003 Chrysler Town & Country

2 Answers

My car isnt charging the alternator is good the battery is good i took the alternator off and had it checked and its good i put it back on the car and its not working what can i check now and by the way...


check the wires going to the alternator, the large red wire should have 12 volt all the time if not check the fusible link at the starter large post..........the small red wire should have 12 volt all the time if not check the small fusible link at starter large post............brown wire should have 12 volt only when the key is in the run position if not check the charge fuse in the fuse box................good luck

Mar 17, 2011 | 1983 Oldsmobile Delta 88

2 Answers

My son jumped 1998 neon backwards now won't charge, already changed alternator.


Check main fuses to the alternator, there are also fusible links and one may have blown.

Dec 23, 2010 | 1998 Dodge Neon

1 Answer

1994 Mazda Protege, new battery, new alternator, wont charge


You must have blown a master fuse or fusible link.

Refer to the maintenance manual.

this happens sometimes during a jump start or a direct short in the elect system.

r/
David

Jan 14, 2010 | 1994 Mazda Protege

1 Answer

No charge to battery


IN ORDER:
Check the 120amp Alternator Fusible link#13 (for 2002 model) located in the fusible link block. (Note: a fusible link is a properly sized piece of wire that is designed to provide major protection when a short occurs) as regular fuses provide minor issue protection.

Check the 5amp ALT-S fuse as this directly affects charging.

Lastly check the 10amp IG2 fuse.

You may find that you have now have a spare alternator (your orginal that was ok) OR You can always sell it on ebay or craigslist.

Mar 19, 2009 | 1998 Toyota RAV4

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