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| andydef90 Member Since: 09 Feb 2015 Location: yorkshire Posts: 617   
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have you checked the battery
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3rd Feb 2019 7:39am |
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| nihwrd Member Since: 12 Apr 2012 Location: Somerset Posts: 28 |
I had assumed that as the fault was the same when jump starting it wasn't the battery, but am I wrong?
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3rd Feb 2019 8:27am |
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| shropshiredefender Member Since: 05 Jun 2017 Location: Shropshire Posts: 834  
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Your problem sounds battery or starter motor related.
Well worth having a drop test done on the battery (or substituting it with a known good one) to eliminate that as the problem before going to more complicated things. |
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3rd Feb 2019 12:30pm |
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| custom90 Member Since: 21 Jan 2010 Location: South West, England. Posts: 20270
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Check battery voltage and that the clamps are tight, loose battery clamps can cause this.
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3rd Feb 2019 12:33pm |
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| Cupboard Member Since: 21 Mar 2014 Location: Suffolk Posts: 2971 
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That sounds like a battery or cabling issue, but if you've eliminated all of them then it's worth having a look at the relays under the driver's seat. The main power relay is under there and weird things happen when that goes wrong.
This time last year, I had recurring starting issues, the symptoms were that as the engine turned over the gauges flapped around and it didn't fire. I even tried jump starting it once and that didn't fix it. The fix was to take the relay, wiggle it about a bit and put it back in. That lasted for a week or two, then it would fail again. The long term fix has been to take the relay out, tighten the terminals and put it back in. |
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3rd Feb 2019 6:28pm |
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| nihwrd Member Since: 12 Apr 2012 Location: Somerset Posts: 28 |
So, update:
Voltage tested the battery - 11.9v Drop tested the battery - no problems. Voltage at FLU is 11.9v both sides. Voltage at starter fuse is 11.9v both sides Removed, wiggled and replaced the starter relay. Symptoms remain the same, lights etc all work well and start cycle normal until ignition when gauges drop to zero and lights dim but no turn over. Was thinking immobiliser but only have a simple engine code reader so can't confirm it, but have tried all the normal on/off cycles. Other than trying a new battery (will try that tomorrow) anyone else got any ideas? Nick |
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9th Feb 2019 4:46pm |
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| MK Member Since: 28 Aug 2008 Location: Santiago Posts: 2403  
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Did you check earth points to chassis (and tbox). Puma 110" SW
............................................................. Earth first. Other planets later |
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9th Feb 2019 5:11pm |
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| lohr500 Member Since: 14 Sep 2014 Location: Skipton Posts: 1314 
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If you have jump leads, try running an earth connection direct from the battery to the engine block. If there is no noticeable improvement, then it probably isn't an earthing issue.
Could be a worn/burned out starter that is shorting to earth when engaged. |
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9th Feb 2019 6:09pm |
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| shropshiredefender Member Since: 05 Jun 2017 Location: Shropshire Posts: 834
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From memory resting battery voltage should be around 12.6v |
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9th Feb 2019 6:49pm |
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| custom90 Member Since: 21 Jan 2010 Location: South West, England. Posts: 20270
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^^^^ Yes, typically 12.1 - 12.6v at rest approximately. 13.2 - 14.8v with motor running with alternator charging current.
Have you tested voltage with motor running? If there is not charging voltage that could well be you issue and a sign of Alternator failiure. Another possibly maybe parasitic drain at rest, drawing a small current from the permanent live reducing voltage lower than it should be whilst off. Do you have any relay coils energised or any form of low draw current load on it whilst off or incorrectly wired? There is a milliamperes draw as standard for the Alarm, clock, HU settings etc but so low it's not an issue. Often up to around 45mA. A 120mA draw at rest for a few days can drop voltage back enough to cause poor starting. You can test with a multimeter for parasitic draw by testing current in series at rest. If it is excessive, if present then it will be parasitic current drain which will need tracing to source. I had this once with a spotlight Relay, wired in by the previous owner they had the Relay coil permanent 12v energised which caused a small but parasitic draw on the battery which then in turn was reducing battery voltage after a couple of days casing poor starting and leave it long enough and no starting at all. Loose battery clamps or connections can also cause a lot of issues, check there is no obvious loose connetions at the Alternator, and starter too if possible but I doubt these are issues to be honest. |
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9th Feb 2019 8:19pm |
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| Kev9t Member Since: 05 Dec 2017 Location: Birmingham Posts: 29 
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Hi
Have you took the 10mm earths off the side of the gearbox give them a clean and do them back up also the earth under the driver side wheel arch (bluk head to chassis) this happened to me when I rebuilt mine last year and it was the earths (10mm) on the gearbox drivers side give it a go. |
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9th Feb 2019 8:50pm |
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| nihwrd Member Since: 12 Apr 2012 Location: Somerset Posts: 28 |
Hi all
Thanks for all the advice, which was really useful. Problem eventually traced to a faulty ignition barrel, so all well now! Nick |
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24th Feb 2019 8:05pm |
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| leeds Member Since: 28 Dec 2009 Location: West Yorkshire Posts: 8580
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If the battery voltage across the terminals is 11.9 volts then the state of charge of the battery is about 35%
Sounds like your battery could do with a good charge. Glad you have solved the problem with the ignition barrel. Now if the battery is the original one it would be getting a bit long in the tooth/tired. Might be worthwhile keeping an eye on its resting voltage. Brendan |
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24th Feb 2019 9:52pm |
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