Battery light?

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Battery light? - 5/12/2008 11:07:55 PM    tailchaser0527   Posts: 171 Joined: 4/19/2006 Status: offline Noticed the battery light on my DII was on today.  When I got home I checked the battery, it's good.  Checked the mega 150A fuse (which caused me lots of probs just this past feb.), it's good. So this lead me to believe that it's the alternator. Checked the voltage at the mega fuse (it's easier to reach than the alternator) it's the same as the battery, running or not. The truck sat for a few hours, when I fired it up, to move it into the garage the battery light was off? So, I drove it around for a few, and the battery light didn't come back on until the truck warmed up to operating temp. I down shifted, the rpms went to about 2800, the light went off.  Two minutes later, the light was back on and stayed on this time.  Any Ideas?  Did I catch the alternator just as it was going out?  _____________________________ '99 DII 125k, 265/70/16 dueler A/T's. TJM T17 steel bumper w/2 hella 130w lights. And a nice big dent in the roof from recent meeting w/tree branch. Post #: 1

RE: Battery light? - 5/13/2008 6:54:49 AM    Landzu   Posts: 2080 Joined: 4/7/2005 From: Dallas TX Status: offline The Alternator is on the way out its still putting out voltage but not enought, thats why at high rpm the light whent off. _____________________________ I do not need the National Geographic channel I just look out the windows of my Land Rover Discovery code name Romulus Prefix-N or 1996 Classic Discovery, RPi remapped ECU NRP Preformance cats/Y-pipe (in reply to tailchaser0527) Post #: 2

RE: Battery light? - 5/13/2008 7:02:43 AM    Disco Mike Posts: 10365 Joined: 4/27/2006 Status: offline Lets get specific. How did you test the battery, what was the exact voltage? Did you check the belt, is it tight? I would suggest you go to your local auto parts store and have them do a load test on both the battery and alternator. _____________________________ Mike Retired service manager. Member of the Solihull Society, NCLR club,past member of the SCLR club and Santa Barbara 4 Wheelers. 99 D2, 3" lift, lockers, H.D. axles, 4:11 gears, Custom front and rear bumpers, Warn winch, HID lights and an Engel 45. (in reply to Landzu) Post #: 3

RE: Battery light? - 5/13/2008 8:24:13 AM    tailchaser0527   Posts: 171 Joined: 4/19/2006 Status: offline OK,  Took the alternator off, and took it to several parts stores, and an auto electric specialty shop, all said that the alternator is flawless??  Load tested the battery and it is perfect.  The belt is tight, and was changed in february along with the battery and mega fuse. Any other ideas???  In the meantime, i'm gonna re-install the alternator and see if the light is on when cold, and comes on again at operating temp. Also, if someone could verify.. My disco is supposed to stall anytime the battery cable is disconnected, good , or bad alternator, correct?  A kid at one of the parts stores suggested the "remove battery cable alternator test" to me, insisting that it worked on every vehicle.   _____________________________ '99 DII 125k, 265/70/16 dueler A/T's. TJM T17 steel bumper w/2 hella 130w lights. And a nice big dent in the roof from recent meeting w/tree branch. (in reply to Disco Mike) Post #: 4

RE: Battery light? - 5/13/2008 8:28:30 AM    Disco Mike Posts: 10365 Joined: 4/27/2006 Status: offline Your engine should not stall when disconnecting the cable as long as your battery has between 13.6 and 14.4 volts. How many volts do you have at the terminals when the engine is off, and when running? _____________________________ Mike Retired service manager. Member of the Solihull Society, NCLR club,past member of the SCLR club and Santa Barbara 4 Wheelers. 99 D2, 3" lift, lockers, H.D. axles, 4:11 gears, Custom front and rear bumpers, Warn winch, HID lights and an Engel 45. (in reply to tailchaser0527) Post #: 5

RE: Battery light? - 5/13/2008 8:28:31 AM    tailchaser0527   Posts: 171 Joined: 4/19/2006 Status: offline Battery voltage is 12.5  my cousin (who is a ford diesel mechanic) brought a load tester, which can be best described as battery cables, connected to a space heater equipped with a volt meter, and a toggle switch. _____________________________ '99 DII 125k, 265/70/16 dueler A/T's. TJM T17 steel bumper w/2 hella 130w lights. And a nice big dent in the roof from recent meeting w/tree branch. (in reply to Disco Mike) Post #: 6

RE: Battery light? - 5/13/2008 9:34:33 AM    tailchaser0527   Posts: 171 Joined: 4/19/2006 Status: offline 12.5 v at the terminals, running or not. _____________________________ '99 DII 125k, 265/70/16 dueler A/T's. TJM T17 steel bumper w/2 hella 130w lights. And a nice big dent in the roof from recent meeting w/tree branch. (in reply to Disco Mike) Post #: 7

RE: Battery light? - 5/13/2008 11:30:53 AM    Disco Mike Posts: 10365 Joined: 4/27/2006 Status: offline 12.5 is too low to handle the ECUs, need to look into this further, you need at least 13.6 volts. _____________________________ Mike Retired service manager. Member of the Solihull Society, NCLR club,past member of the SCLR club and Santa Barbara 4 Wheelers. 99 D2, 3" lift, lockers, H.D. axles, 4:11 gears, Custom front and rear bumpers, Warn winch, HID lights and an Engel 45. (in reply to tailchaser0527) Post #: 8

RE: Battery light? - 5/13/2008 11:32:54 AM    tailchaser0527   Posts: 171 Joined: 4/19/2006 Status: offline Alright..  Mike, i'm gonna need your help.. I put the alternator back in, cranked the truck and the battery light was still on. I only had a test light handy, so I checked all fuses, and connections, including the two wires on the back of the alternator. The large wire had power, but the small wire had none. Went back inside the vehicle, rev'd up the motor to about 4k rpms. Battery light went out and stayed out.  And now there is power on the small wire on the back of the alternator. I let the truck idle for about 10 min and the light was still out. Any ideas?? What exactly is the small wire's role? I know it passes through a 10a fuse and to the key switch. But i'm not quite sure what it does exactly? < Message edited by tailchaser0527 -- 5/13/2008 2:19:22 PM > _____________________________ '99 DII 125k, 265/70/16 dueler A/T's. TJM T17 steel bumper w/2 hella 130w lights. And a nice big dent in the roof from recent meeting w/tree branch. (in reply to tailchaser0527) Post #: 9

RE: Battery light? - 5/13/2008 4:12:30 PM    Disco Mike Posts: 10365 Joined: 4/27/2006 Status: offline Are you looking at the tack lead? Drive down to a local auto parts store and get the system load tested, I know you have done it out of the truck now do it the correct and easy way, and it's free. _____________________________ Mike Retired service manager. Member of the Solihull Society, NCLR club,past member of the SCLR club and Santa Barbara 4 Wheelers. 99 D2, 3" lift, lockers, H.D. axles, 4:11 gears, Custom front and rear bumpers, Warn winch, HID lights and an Engel 45. (in reply to tailchaser0527) Post #: 10

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