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03-08-2016
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Established Member
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Join Date: Apr 2012
Location: Salisbury S.A.
Posts: 160 What Jeep do I drive?: ZJ
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Liked 7 Times in 4 Posts
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Alternator voltage
Hi all again , more drama's ! . Yesterday cleaned the IAC valve , run round the block , all good , This morning start her up , fine , then I notice Alternator light stays on . Yesterday the Battery was fine , eye check hole was bright Green , this morning no colour . I think the under bonnet may have discharged the battery , so ive put her on a 20amp charger for a while and its Green again , so what id like to know is Chicken or the egg , did alternator flatten the Battery or was the Alternator light on because the battery is buggered ? , cheers.
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03-08-2016
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RubiconSlammer
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Join Date: May 2011
Location: Ipswich, Brisbane.
Posts: 1,250 What Jeep do I drive?: ZJ
Likes: 115
Liked 281 Times in 182 Posts
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Just look at the voltmeter on the dash (I presume the ZJ has a volt meter, if not stick a multimeter on the battery) If its sitting on 12, 12 1/2 volts and goes up to around 14 when you start the motor, you can be pretty sure the alternator is OK.
__________________
'98 XJ (Deceased)
'04 KJ 2.4 L petrol(sold)
'98 ZJ current restoration project
Last edited by Billnick; 03-08-2016 at 03:24 PM.
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03-08-2016
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Established Member
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Join Date: Apr 2012
Location: Salisbury S.A.
Posts: 160 What Jeep do I drive?: ZJ
Likes: 0
Liked 7 Times in 4 Posts
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Quote:
Originally Posted by Billnick
Just look at the voltmeter on the dash (I presume the ZJ has a volt meter, if not stick a multimeter on the battery) If its sitting on 12, 12 1/2 volts and goes up to around 14 when you start the motor, you can be pretty sure the alternator is OK.
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Thanks for reply , twice tested after turning it on , once 11.54 volts this morning then 12.31 after charging battery . Had battery checked , its o'k' . Tomorrow i'll inspect/clean all leads and connections , then test again . This low voltage may have something to do with my suspected fuel starve issues ? , cheers.
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03-08-2016
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RubiconSlammer
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Join Date: May 2011
Location: Ipswich, Brisbane.
Posts: 1,250 What Jeep do I drive?: ZJ
Likes: 115
Liked 281 Times in 182 Posts
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12.3 is a bit low. A good battery at rest is about 12.7v.
I do know our burglar alarms used to play up for no apparent reason, changing the battery fixed them, even though the battery tested ok.
__________________
'98 XJ (Deceased)
'04 KJ 2.4 L petrol(sold)
'98 ZJ current restoration project
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03-08-2016
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Established Member
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Join Date: Apr 2012
Location: Salisbury S.A.
Posts: 160 What Jeep do I drive?: ZJ
Likes: 0
Liked 7 Times in 4 Posts
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Quote:
Originally Posted by Billnick
12.3 is a bit low. A good battery at rest is about 12.7v.
I do know our burglar alarms used to play up for no apparent reason, changing the battery fixed them, even though the battery tested ok.
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Watched a demo , at 13,0 volts pump had about 50psi , at 11.0 volts 30psi , that's what I was probably getting sometimes at the pump , maybe even less . I don't reckon the car would run properly at those figures .
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05-08-2016
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Established Member
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Join Date: Apr 2012
Location: Salisbury S.A.
Posts: 160 What Jeep do I drive?: ZJ
Likes: 0
Liked 7 Times in 4 Posts
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Hi , an update . My Alternator seems to have been at fault al along , got one from the Wreckers 50$ , a relitivley cheap way of finding out what was wrong ! . Mind you have learn't how to test a TPS ,CAS and the fuel delivery system in the mean time , so not all bad .
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