12V Hot only when engine running - Page 2 - Land Rover Forums : Land Rover and Range Rover Forum
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post #16 of 26 (permalink) Old 07-24-2018, 06:11 PM
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With all due respect why would you disconnect that wire from the alternator?

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post #17 of 26 (permalink) Old 07-24-2018, 07:43 PM
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To isolate the terminal so it gets power from the alternator only, not from Fuse 27 via the alternator warning light.

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post #18 of 26 (permalink) Old 07-25-2018, 12:38 AM
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I still want to know why he can’t use ignition power. Why can it only be powered when the engine is running. This debate is all a bit pointless as far as I can tell.
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post #19 of 26 (permalink) Old 07-25-2018, 04:31 AM
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I dont consider it a debate but a friendly polemic where everybody can learn something
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To isolate the terminal so it gets power from the alternator only, not from Fuse 27 via the alternator warning light.
hey @Redrover NC please think twice about the bolded part and eventually you answer the last question from post #10 https://www.landroversonly.com/forum...09-post10.html

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2000 Discovery Td5 ES manual

Hawkeye v.6, Nanocom EVO,
VDM UCANDAS, oscilloscope


if you think my english is peculiar it means you didnt hear my japanese

ALL MY ADVICES ARE BASED ON MY OWN KNOWLEDGE AND MY WAY OF UNDERSTANDING THE DESCRIPTION AND OPERATION OF SYSTEMS... I'M NOT A LAND ROVER TRAINED SPECIALIST JUST AN ADDICTED ENTHUSIAST.
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post #20 of 26 (permalink) Old 07-25-2018, 05:04 AM
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I dont consider it a debate but a friendly polemic where everybody can learn something
I am not sure what anyone is learning. You state that the wire does nothing except operate the warning light. You then do not like someone suggesting disconnecting it and using the point on the alternator to power whatever this mystery thing is that can only run with the engine running. By your explanation the only difference that disconnecting it will make is that the warning light will no longer light up
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post #21 of 26 (permalink) Old 07-25-2018, 06:15 AM
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By your explanation the only difference that disconnecting it will make is that the warning light will no longer light up
Yes that's what i'm saying and that why disconnecting it and loose the warning while it will act the same connected with the warning on and it's just about splice in it with one side of a relay's coil and the other to ground which means that the relay will close only when the alternator will start running, the OP explained on other forum why he wants a feed only with engine running and he even found a better option with the oil pressure switch which for my shame didnt cross my mind: https://www.4x4community.co.za/forum...engine-running

My friends call me Fery

2000 Discovery Td5 ES manual

Hawkeye v.6, Nanocom EVO,
VDM UCANDAS, oscilloscope


if you think my english is peculiar it means you didnt hear my japanese

ALL MY ADVICES ARE BASED ON MY OWN KNOWLEDGE AND MY WAY OF UNDERSTANDING THE DESCRIPTION AND OPERATION OF SYSTEMS... I'M NOT A LAND ROVER TRAINED SPECIALIST JUST AN ADDICTED ENTHUSIAST.
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post #22 of 26 (permalink) Old 07-25-2018, 09:37 PM
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the OP explained on other forum why he wants a feed only with engine running and he even found a better option with the oil pressure switch which for my shame didnt cross my mind: https://www.4x4community.co.za/forum...engine-running
As I thought, the ignition power circuit would do exactly what he wants. There was absolutely no need to go looking for something that is only active with engine running. Going and buying a voltage sensitive relay, that are relatively cheap, would be even better
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post #23 of 26 (permalink) Old 07-26-2018, 09:11 AM Thread Starter
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As I thought, the ignition power circuit would do exactly what he wants. There was absolutely no need to go looking for something that is only active with engine running. Going and buying a voltage sensitive relay, that are relatively cheap, would be even better


VSRs arenít easy to come by in my neck of the woods. Thereís really only one on the market and it wonít work without a dual battery.


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post #24 of 26 (permalink) Old 07-26-2018, 03:38 PM
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VSRs arenít easy to come by in my neck of the woods. Thereís really only one on the market and it wonít work without a dual battery.


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That is what Amazon is for https://www.amazon.com/Voltage-Sensi...ensitive+relay
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post #25 of 26 (permalink) Old 07-26-2018, 04:01 PM
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Designed for dual battery...
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post #26 of 26 (permalink) Old 07-27-2018, 04:21 PM
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You can get power directly from the alternator to a 11-15 volt input, 12 volt output regulator to feed your relay. this way you do not mess with the car's other pieces of equipment.
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