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Idiot wire question
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Philip1972
 


Member Since: 10 Mar 2017
Location: Gloucestershire
Posts: 1072

United Kingdom 2011 Discovery 4 3.0 SDV6 GS Auto Zermatt SilverDiscovery 4
Idiot wire question

I have a leisure battery in my car and there are 2 wires in the cabin, a positive and a negative.

But they are not marked, so can anyone tell me how to check which is which before I put an inverter in.

If it helps, I have a multimeter.

Cheers Thumbs Up  
Post #204614115th Apr 2019 5:04 pm
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PROFSR G
 


Member Since: 06 Mar 2017
Location: Lost
Posts: 4651

Ukraine 2009 Discovery 3 TDV6 Commercial XS Auto Stornoway GreyDiscovery 3

The multimeter if with digital screen will tell you with a - symbol when polarity is connected wrong way around. Set it to 20v and connect the probes, if -12v appears you have the 12v supply on the neg probe!

There are simpler ways, but unless you're fond of bright sparks I'll leave that where it belongs Laughing yµ (idµ - eAµ) ψ=mψ

  
Post #204615015th Apr 2019 5:26 pm
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sasdiscos
 


Member Since: 22 Feb 2013
Location: Northants
Posts: 886

United Kingdom 2010 Discovery 4 3.0 TDV6 HSE Auto Bali BlueDiscovery 4

Your meter should read -12v if it’s the wrong way round. You remind me of a younger me, not much younger mind...perhaps even a little older!  
Post #204615115th Apr 2019 5:26 pm
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Philip1972
 


Member Since: 10 Mar 2017
Location: Gloucestershire
Posts: 1072

United Kingdom 2011 Discovery 4 3.0 SDV6 GS Auto Zermatt SilverDiscovery 4

Thank you! Thumbs Up  
Post #204616115th Apr 2019 5:51 pm
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Ceekay
 


Member Since: 17 May 2009
Location: Bury
Posts: 2057

United Kingdom 2016 Discovery 4 3.0 SDV6 HSE Lux Auto Waitomo GreyDiscovery 4

OR use a test lamp between each cable and the bodywork and as long as the Aux battery is earthed to the bodywork you will be able to tell which one is live as the earth to earth connection (negative) on the test lamp will not light. (that's assuming you have wired the aux battery that way of course) D4 HSE Lux MY16 Club Waitomo
D3 HSE MY06 missing her still…  
Post #204617015th Apr 2019 6:09 pm
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