Battery not holding charge
#1
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I was given an 85 xj6 series III. It wasn't running. Upon looking it has a New starter, New battery, New fuel pump...I have checked and cleaned most wires, spark, and I believe I've made it to the point of replacing the ECU (it's on its way in mail) There is no fuel to injectors. I put in some gas as well. I am curious why the battery would keep draining and not hold a charge at all? ...here is to hoping the ECU gets it started too.
#2
Join Date: Mar 2015
Location: Dural, Northwest Sydney. Australia.
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#3
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Hi Charlene n John,
Welcome to the forum.
Check that a previous owner didn't have something electrical like a car alarm fitted.
I bought my Series 3 back in March and had a similar problem of the battery not holding charge overnight.
I bought a new battery and all.
Turns out that although I wasn't using it and it was 'off', the after market alarm system was draining the battery as it was still wired in.
It didn't help that I had an intermittent fault in the alternator so that it wouldn't properly charge whilst running.
It's usually the small things that make you scratch your head with these cars![Smile](https://www.jaguarforums.com/forum/images/smilies/smile.gif)
Cheers and happy motoring,
Nigel
Welcome to the forum.
Check that a previous owner didn't have something electrical like a car alarm fitted.
I bought my Series 3 back in March and had a similar problem of the battery not holding charge overnight.
I bought a new battery and all.
Turns out that although I wasn't using it and it was 'off', the after market alarm system was draining the battery as it was still wired in.
It didn't help that I had an intermittent fault in the alternator so that it wouldn't properly charge whilst running.
It's usually the small things that make you scratch your head with these cars
![Smile](https://www.jaguarforums.com/forum/images/smilies/smile.gif)
Cheers and happy motoring,
Nigel
#7
Join Date: Jul 2012
Location: Walnut Creek, California
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Welcome Charlene n John!
Another male and female Jaguar team????
1. Charge the battery. Ask a local parts house to load test it. Most will for free, obviously hoping for a sale!!!
2. Turn off all lights, radio, heater, ignition and anything else that you think of.
Disconnect the _ battery cable. Connect your VOM meter in series. Read the amp scale. .045 miliamps or so normal. Rough test. if no VOM use a test light. Very dim light probably OK. Bright, nope.
If it flunks those tests, find the closed circuit that should be closed. R&R fuse by fuse while checking amps or light;
As stated. after market alarms and boot lights are known villians.
If the boot light, check back. I have a safe way to check that...
However, a fully charged battery should crank the engine vigorously. Resolve the first and then check back for tour on no crank. I was just there, over and over....
Carl
Another male and female Jaguar team????
1. Charge the battery. Ask a local parts house to load test it. Most will for free, obviously hoping for a sale!!!
2. Turn off all lights, radio, heater, ignition and anything else that you think of.
Disconnect the _ battery cable. Connect your VOM meter in series. Read the amp scale. .045 miliamps or so normal. Rough test. if no VOM use a test light. Very dim light probably OK. Bright, nope.
If it flunks those tests, find the closed circuit that should be closed. R&R fuse by fuse while checking amps or light;
As stated. after market alarms and boot lights are known villians.
If the boot light, check back. I have a safe way to check that...
However, a fully charged battery should crank the engine vigorously. Resolve the first and then check back for tour on no crank. I was just there, over and over....
Carl
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