2000 Cadillac Seville Alternator Compatibility

Tiny
SCORPEON40
  • MEMBER
  • 2000 CADILLAC SEVILLE
  • 138,000 MILES
Alternator for my 00 seville went out. I found one at a salvage yard from a 99 seville. Matched perfectly watercooled etc. After install Im having issues I dont understand. Its showing voltage ok on dash at 17.8 but it will still run the car no problem other than will not charge battery. I do have a smaller battery in it than called for. Could the smaller battery be confusing system some how? I dont believe that to be my problem but im not sure. The local cadilac dealership told me the 00 should have a 150 amp alternator and the 99 had a 140 amp alternator. And then at advanced when getting old alternator checked the one the sold for 00 was 138 amp so this dont make no sense but after doing some research Ive learned through one resourse that there is other differences in the 99 and the 00 oem alternators. Is the 99 compatible in my 00 or do I have another issue. Looking for for any help before I go back in to take investigate wiring connections and or take 99 off as this is not just any alternator change out thanks ahead
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Friday, June 14th, 2013 AT 8:27 PM

12 Replies

Tiny
SATURNTECH9
  • EXPERT
So at idle checking the voltage at the battery itself with a multi meter what does the voltage read?Also what did the battery voltage on the dash show with the old alternator before you changed it?Was the old alternator tested as bad?
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Friday, June 14th, 2013 AT 8:39 PM
Tiny
SCORPEON40
  • MEMBER
Old alternator tested. No voltage output Yes tested at battery around with smart charger And with battery unhooked tested with multivoltmeter 11.7. Same as jump terminal under hood and in dash It doesn't change with a load or not Old alternator said baterry not charging in dash
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Friday, June 14th, 2013 AT 9:21 PM
Tiny
SATURNTECH9
  • EXPERT
Never unhook the battery with it running charging or not let's check the power inputs to the alternator. Key in the run position with the engine not running. The orange wire should have battery voltage. The red wire should have voltage. Then the red wire should have power.
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Friday, June 14th, 2013 AT 9:51 PM
Tiny
SCORPEON40
  • MEMBER
Ok there's a orange wire that has around 12 v. Red wire has nothing. And a tan wire that had nothing and this is with switch on engine off while plugged into alternator the big red wire also had volts battery was dead so had charger hooked to battery
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Saturday, June 15th, 2013 AT 12:17 AM
Tiny
SCORPEON40
  • MEMBER
Ok been waiting all day for response. Pls help lol
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Saturday, June 15th, 2013 AT 12:44 PM
Tiny
SATURNTECH9
  • EXPERT
Sorry I work full Time and juggle answering questions on here. Which model do you have SLS or sts?I have for wires to the alternator two red wires a orange one and gray one?If you don't have power to the small red one to the alternator we need to check that wire back to the computer which is left front of engine compartment bellow air cleaner.
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Saturday, June 15th, 2013 AT 3:08 PM
Tiny
SCORPEON40
  • MEMBER
It's an sls. So the big red wire runs from alternator and charges battery. Do the wires on the plug all run into alternator? When u say small red wire has power. Wat an I looking for it to read on my meter? The grey should not nothing until a call for charge?
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Sunday, June 16th, 2013 AT 10:32 PM
Tiny
SATURNTECH9
  • EXPERT
The big red one comes from the battery and has battery voltage. The little red one should read battery voltage also with the key in the run position engine off. The little red one comes from the computer. The gray wire should be for the battery light. They all go inside the alternator.
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Sunday, June 16th, 2013 AT 10:40 PM
Tiny
SCORPEON40
  • MEMBER
And the orange one?
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Sunday, June 16th, 2013 AT 11:36 PM
Tiny
SATURNTECH9
  • EXPERT
It should have battery voltage like I said in a earlier post with the key in the run position engine off. Also the orange wire is powered by a fuse in the under hood fuse box.
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Monday, June 17th, 2013 AT 6:51 AM
Tiny
SCORPEON40
  • MEMBER
Well I have been more confused than ever I traced the best I could the small red wire from plug to brain not finding anything with that wire I did find a plug unplugged that was located behind an engine mount that I believe to have been unplugged for sometime but I'm not sure I believe it to have been from were I had mount replaced a couple years back not sure Wat it went to possibly oil pressure or something. After checking it did not appear to have changed anything in readings. The next day after corresponding with you more about Wat the wires should have on them and were they came from. I had unplugged plug checking from plug end unplugged as well wires from plug with plugged up. And after plugging back in then suddenly what I am getting has all changed. Now insteAd of low voltage on dash it's high voltage but only on dash. When first cracking car it says battery not charging service system. And after a bit the light will come on tthem it will show 16.4 voltage hi and will after a minute settle to 13.5 swing voltage ok With car running putting a load on system it will drop to as low as 11.8 and when you take load off it then will go back up to 16.4 on dash but will stay co stand at battery with volt meter at 13.5 and at dash will after a few seconds to a minute will on dad will settle back to 13.5 and say ok. But light will stay on throughout. I have discovered a possible cause but altrnator will have to taken off to know witch is were the plug plugs to alternator a potion of the female side is missing its tge cup part with wat the clip clips on to hold tight. Cant see what or how much is broken from there can see all prongs are still there and it is tight when pluggen but im thinking if cracked on up into reguator hausing this coukd cause all of weid readings other than the fact that when checking wires while in run position and engine off with plug plugged or unplugged in not getting nothing but mv at harness on any of wires at the fuse for orate wire if I am on the right fuse 'PCM batt'. If remember correctly I'm get voltage at fuse the large red wire has voltage but only 8-9 volts All this has me confused as I possibly can be. Ive already contacted online salvage yard to see about another alternator even if not causing problems it needs to be able to clip to stay tight. As far as any of the other readings I don't have a clue I am going to put new batteries in my multimeter and check everything again though I don't think it's reading incorrectly No low battery signal as well as I used it to check some 1.5 volt batteries and it worked fine. I realize this is alot of info and your probably wondering wats up with me and the car but so you know I am too at this point. I appreciate you hep and feedback. Thanks. Todd
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Tuesday, June 18th, 2013 AT 1:02 PM
Tiny
SATURNTECH9
  • EXPERT
For starters the big red wire to the alternator should have full battery voltage? Sounds like its trying to charge but sounds like its charging too high. Also with you playing with connections and things changed sounds like you have a bad connection somewhere. Refresh my memory was the used alternator ever been bench tested before installing it?
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Tuesday, June 18th, 2013 AT 1:44 PM

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