Changed Alternator and now Electrical Problems
Senior Member
Joined: Feb 2024
Posts: 164
Likes: 72
From: England
I am in the UK 2007 Jaguar XK. The alternator became noisy and so I have changed it for a new unit form a UK Jag specialist . Its a pattern part appears of good quality .
Now on start up I have a battery not charging message on the dash and after about 10 seconds the radiator cooling fan comes on full blast and stays on until shut down, actually runs 15 seconds after shut down.
The car has been without fault until now .
I have two batteries to choose from a regular and an AGM. At rest they are both above 13 volts. The batteries are not faulty I do not have a low or damaged or discharged battery . When the engine is running I am seeing about 14.2/14.5 volts so I think it is actually charging .
So my two issues are the not charging warning on the dash and the cooling fan coming on .
Appreciate of any thoughts . Thanks
Now on start up I have a battery not charging message on the dash and after about 10 seconds the radiator cooling fan comes on full blast and stays on until shut down, actually runs 15 seconds after shut down.
The car has been without fault until now .
I have two batteries to choose from a regular and an AGM. At rest they are both above 13 volts. The batteries are not faulty I do not have a low or damaged or discharged battery . When the engine is running I am seeing about 14.2/14.5 volts so I think it is actually charging .
So my two issues are the not charging warning on the dash and the cooling fan coming on .
Appreciate of any thoughts . Thanks
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Member
Joined: Jun 2024
Posts: 65
Likes: 23
From: UK
Thanks. I bought from a Jag specialist a pattern part with a cross referencing to the original unit and my troubles began . I am hoping this weekend to try the original,now with new bearings and another identical used unit to see if my troubles end .
Senior Member
Joined: Feb 2024
Posts: 164
Likes: 72
From: England
Probably a chineseimun part, they won't cut the mustard with a Jaguar XK - they need to be denso OE quality
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Member
Joined: Jun 2024
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From: UK
Thank you for the replies. If only it was that simple . The NAPA part you have linked , made in China! Appreciate your help let's see what this weekend brings.
Senior Member
Joined: Feb 2024
Posts: 164
Likes: 72
From: England
There's nothing stopping China making OE quality goods, that's up to the manufacturer - NAPA are reputable - how much did you pay for the original alternator as most quality ones will be upwards of £200 for a decent OE replica
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From: UK
As an aside I have spent a lot of time in Chinese manufacturing plants over the past 8 years and UK ones too. On ballance the Chinese ones are ahead in my view.
Senior Member
Joined: Feb 2024
Posts: 164
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From: England
I have ordered that NAPA one after checking with them they would take it back if it did not work. They confirmed made in China.
As an aside I have spent a lot of time in Chinese manufacturing plants over the past 8 years and UK ones too. On ballance the Chinese ones are ahead in my view.
As an aside I have spent a lot of time in Chinese manufacturing plants over the past 8 years and UK ones too. On ballance the Chinese ones are ahead in my view.
As for China, I have been there on business they make some of the worst junk possible and also they make stuff as good as anyone else - it depends on how much Quality Control and attention to detail is used - it goes without saying the more expensive stuff usuallly costs more.
Let us know how it goes, you said you had a AGM battery have you put in a regular SLA battery in to see if the battery not charging goes away? Replacing the alternator is a huge pain in the axe
Senior Member
Joined: Feb 2024
Posts: 164
Likes: 72
From: England
I am in the UK 2007 Jaguar XK. The alternator became noisy and so I have changed it for a new unit form a UK Jag specialist . Its a pattern part appears of good quality .
Now on start up I have a battery not charging message on the dash and after about 10 seconds the radiator cooling fan comes on full blast and stays on until shut down, actually runs 15 seconds after shut down.
The car has been without fault until now .
I have two batteries to choose from a regular and an AGM. At rest they are both above 13 volts. The batteries are not faulty I do not have a low or damaged or discharged battery . When the engine is running I am seeing about 14.2/14.5 volts so I think it is actually charging .
So my two issues are the not charging warning on the dash and the cooling fan coming on .
Appreciate of any thoughts . Thanks
Now on start up I have a battery not charging message on the dash and after about 10 seconds the radiator cooling fan comes on full blast and stays on until shut down, actually runs 15 seconds after shut down.
The car has been without fault until now .
I have two batteries to choose from a regular and an AGM. At rest they are both above 13 volts. The batteries are not faulty I do not have a low or damaged or discharged battery . When the engine is running I am seeing about 14.2/14.5 volts so I think it is actually charging .
So my two issues are the not charging warning on the dash and the cooling fan coming on .
Appreciate of any thoughts . Thanks
This came with the NAPA
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Member
Joined: Jun 2024
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From: UK
To update. Original albeit noisy alternator back on and codes gone and charging properly. It would appear the replacement unit I bought is faulty or wrong spec .
I am getting an original unit rebuild and will go with that .
Swapping it out on a UK car remains a horrible job . Even after three goes practice.
I am getting an original unit rebuild and will go with that .
Swapping it out on a UK car remains a horrible job . Even after three goes practice.
Senior Member
Joined: Feb 2024
Posts: 164
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From: England
Are you saying that the NAPA part did not work? That makes no sense - do you have a regular SLA battery fitted?
Changing the Alternator is a pig, that's why I done all the pulleys and belts at the same time.
Changing the Alternator is a pig, that's why I done all the pulleys and belts at the same time.
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Joined: Mar 2025
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From: Indialantic Florida
Yes..better to do it all..
I had the motor mounts replaced too since you have to lift the engine to get to it..
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Joined: Feb 2024
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From: England
Hmm, when mine was done no mention of the mounts - cooling pipes were removed for easy access.
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