 | Home > Puma (Tdci) > Large voltage drop |
 
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| munch90 Member Since: 26 Oct 2013 Location: guildford Posts: 3558  
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voltage drop sounds about right depends on condition of battery
quite common for the heater connections to melt on transits ,sometimes melting the wire down the loom would be worth checking there are no shorts to earth along glowplug link wire (common on transit) plus check glowplugs are working now and check that connection the melted one is tight |
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24th Mar 2014 1:58pm |
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| fatman Member Since: 14 Jan 2014 Location: Athens-Greece Posts: 126  
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I observed the very same thing.
I run 2 odyssey's PC1500 with a IBS split chargre and and RBM relay from same company. I unlock the puma,voltage monitor shows 12.2-12.8 volts,turn ingition on,voltage dives as yours,wait till glow plugs light goes off an about extra 8 seconds later voltage goes up. Even if i start the engine without waiting this much,charging level rises slowly up to 14+ volts,i can even see the interior light going brighter as if the split charge system acts like a voltage "cushion"?? Initially i thought the batteries are going to die soon.. Even when i link them together when i switch ign to on,same voltage drop at the monitor. When i play with the nanocom,when switching between various ecus,same thing happen(like starting engine first time). Like the split charge system transfers both batteries' energy to get it ready to start? Or i don't want to face the truth that the batteries are dead. Strange things also happen when winching,even with the batteries linked together(winch on main battery) the system doesn't allow much current to reach the winch or again the system masks the batteries' problem? |
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28th Mar 2014 9:25am |
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| munch90 Member Since: 26 Oct 2013 Location: guildford Posts: 3558
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I fitted a fuse to the connection (the melted one in pic ) to try and protect the loom , seen some really burnt looms ,
I know there is a fuse under seat but dosnt blow before loom wire melts |
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28th Mar 2014 9:32am |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17450  
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I have noticed with my '07 Puma that there does indeed seem to be a substantial voltage drop when starting (which not surprising) but also that it takes a surprising time to stabilise at a normal charging voltage after starting.
This is most noticeable if you start the engine with a wet windscreen, and as soon as the engine is running turn the wipers on. The will be very slow for a sweep or two, then as the charging system settles down will accelerate to normal speed. It takes a few seconds for this to happen, something I have never, ever observed on any other vehicle. I don't think it is necessarily indicative of a fault, however, it seems to be just another of the Defender's quirks. |
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28th Mar 2014 1:06pm |
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| munch90 Member Since: 26 Oct 2013 Location: guildford Posts: 3558
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alternator is ecu controlled , ecu switches alternator on after a few seconds of running
a lot of modern cars are like this not like in days where alternator controlled its self |
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28th Mar 2014 1:18pm |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17450
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Ah, interesting! Didn't know that!
That explains it then, thanks. |
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28th Mar 2014 1:34pm |
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| landy andy Member Since: 15 Feb 2009 Location: Ware, Herts Posts: 5729 
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That makes sense then of the delayed recharge. Can stop worrying about t now. I knew something was going on 
Andy |
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29th Mar 2014 4:01am |
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