 | Home > Technical > Isolation Switch Puma Starter Motor AMP Question |
 
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| X4SKP Member Since: 29 Nov 2013 Location: Berkshire Posts: 2290   
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Hello All
Q...What AMPs are drawn by the Starter Motor on a PUMA Engine... 
Reason for asking is that I'm getting round to adding a few (more) Security Layers one of which is the installation of an Isolation Switch. Often described as a 'Battery Isolation Switch', I'm considering the various options for incorporating one (beyond a cleaver tamper-proof location on the vehicle). One approach could be to Isolate only the Power Feed to the Starter Motor, (thereby maintaining the Power Feed from the Battery (underneath front passenger seat) to the Main Fuse Box (under drivers seat) and its distribution on-wards to the ECU / Alarm (etc)... I'm modifying this cable as well due to the inside...outside...inside route this 'vital' cable currently takes...  )
Exploring the Isolator Switch Options, I see that the Starter Motor Feed is clearly identified... 
and the cable initiates from the + Battery Terminal via a 500AMP Mega Fuse (see below) clamping to the Mega Fuse with a M8 Stud. I have (or are getting soon) a Durite Security Battery Isolator Switch with a description of being rated at '100A @ 24V, 500A for 5 secs'. (also using M8 cable fixing studs) So my question is what AMPs are drawn by the Starter Motor on a PUMA Engine when starting and therefore is this Isolator Switch up to the job, if I go down the route of targeting the Starter Motor...
Who knows their electrickery... observations welcome, (including alternative routes / options) 
DURITE Security Battery Isolator Switch http://www.vehicle-wiring-products.eu/prod...tor-switch Click image to enlarge + Terminal Puma Battery (2.4 MY2011) Click image to enlarge Main Red Cable from + Terminal marked as BATT TO STARTER Click image to enlarge Main 'Starter Motor Cable' removed from Terminal showing 500 AMP Mega Fuse connection with thanks... SKIP https://www.defender2.net/forum/topic83242.html |
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22nd Jun 2016 5:47pm |
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| Cupboard Member Since: 21 Mar 2014 Location: Suffolk Posts: 2971 
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Rather than putting it cutting off the starter, why not just stop the control circuits?
It will quite happily run without the starter (you can bump start it) but it won't run without the computers. |
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22nd Jun 2016 6:55pm |
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| X4SKP Member Since: 29 Nov 2013 Location: Berkshire Posts: 2290
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Thanks Cupboard...how do I identity the power feed to 'the computers' / (assume ECU) is this a wise approach? and a completely separate system to the OEM Alarm, thanks again... SKIP
https://www.defender2.net/forum/topic83242.html |
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22nd Jun 2016 8:23pm |
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| Fifth Horseman Member Since: 08 Mar 2011 Location: Lanarkshire Posts: 322 
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Won't work on the 2.4 puma as no lift pump fitted.
Interrupt the switched supply to the engine ECU or you could consider isolating the injectors although this would be more work to conceal the additional wiring. |
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24th Jun 2016 4:57pm |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 16970 
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Or the crankshaft or camshaft position sensors.
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24th Jun 2016 5:14pm |
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| Cupboard Member Since: 21 Mar 2014 Location: Suffolk Posts: 2971
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On mine there's a big cable for the starter and a medium sized cable for everything else. At least that's what I remember. |
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24th Jun 2016 5:55pm |
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| X4SKP Member Since: 29 Nov 2013 Location: Berkshire Posts: 2290
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Thanks for this feedback
Q Has anyone added an Isolation Switch to a PUMA tdci, to prevent it from Starting...
(but maintaining all 'essential' systems Alarm / Central Locking / and permanent lives (Tracker) and possibly other 'aspects' that should not be Isolated...) There are a number of threads on D2N discussing Battery Isolation Switches, and various ideas are explored, a few have asked 'similar' questions...but most threads fizzle out... Has anyone actually done this...on a PUMA...
Happy to receive a PM if you would prefer... 
Thanks SKIP https://www.defender2.net/forum/topic83242.html |
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24th Jun 2016 5:58pm |
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| X4SKP Member Since: 29 Nov 2013 Location: Berkshire Posts: 2290
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Hi Cupboard You are right the RED Cable is direct to the Starter (Bottom of Picture) The Black Shielded Cable (Brown inside) supplies the Main Fuse Box (Right of Picture) The Black Cable (Left of Picture) is my additional 13 PIN Electrical Feed for Towing I don't think upstream of the Main Fuse Box (under drivers seat) you Isolate this wire...nothing will work, down stream maybe, keeping essential features alive (Alarm etc)... I'v posted a question (above) to try and see who knows what... Click image to enlarge SKIP https://www.defender2.net/forum/topic83242.html |
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24th Jun 2016 6:10pm |
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