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| landy andy Member Since: 15 Feb 2009 Location: Ware, Herts Posts: 5434  
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I used a voltage sensing relay. It has three connections, one for earth, and two positives, as soon as the primary positive senses 13ish volts it activates the relay, joining the batteries so both are charging. So it's sensing wire is just the normal battery connection
Andy |
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12th Jan 2014 1:25pm |
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| landy andy Member Since: 15 Feb 2009 Location: Ware, Herts Posts: 5434
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Like this one
http://www.devon4x4.com/index.php?page=sho...;Itemid=14 |
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12th Jan 2014 1:27pm |
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| 110dc Member Since: 12 Jan 2014 Location: wiltshire Posts: 9  
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thanks but I already have bought a relay & it needs a signal from a circuit that's only live when engine running
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12th Jan 2014 4:27pm |
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| VeeTee Member Since: 06 Mar 2011 Location: Somewhere Posts: 1512 
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I think you can use the feed to the charging light:
 Click image to enlarge Cheers, Vincent 1959 Polynorm 1/4 Ton Trailer, Olive Drab Green (sold) 1970 M416 Military Trailer (Camping Trailer Conversion), Epsom Green (sold) 1975 Series III 88 V6, Light Green (sadly sold) 1996 Defender 110 CSW 300 Tdi, Epsom Green (sold) 2000 Freelander 1 TD4 3-drs, Silver (sold) 2006 Freelander 1 TD4 5-drs Facelift Automatic, Tonga Green (sold) MySite |
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12th Jan 2014 4:36pm |
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| munch90 Member Since: 26 Oct 2013 Location: guildford Posts: 3558 
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most modern alternators have more than 1 small wire (most have a multiplug ) and are engine ecu controlled ,so be careful what you connect too!
does the wire have to go to alternator could it not be connected to a ign live wire so unit is only on when ign on. does the unit sense voltage or just need a live ? if just needs a live then a ign live will do .. ok if you were sitting ign on but not running then unit would be on (but I would not sit with ign on for anytime anyway). if you only want it on when engine running then I would fit a voltage sensing relay as feed for that can come from battery as that would on switch on when engine running (alternator charging) . be honest I would not want anything connected to alternator small wires on modern engine |
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12th Jan 2014 7:37pm |
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| diesel_jim Member Since: 13 Oct 2008 Location: hiding Posts: 6050 
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Durite do several VSR's, from hulking great things that have an in built relay, down to smaller ones that can trigger an external relay. Or if you wanted to keep it "LR", then use the VSR off of the 200Tdi defender that ran the heater rear screen... my old 200 was a poverty spec one with a 65a alternator, and came with the VSR for the HRW (how many accronyms?)... if I came to a standstill with my main beam on and heater blowing full, the rear window would turn off  |
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13th Jan 2014 8:53am |
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| 110dc Member Since: 12 Jan 2014 Location: wiltshire Posts: 9
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thanks think ill try an ing live circuit to try it seems easier or maybe look at a different relay
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13th Jan 2014 9:21am |
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| leeds Member Since: 28 Dec 2009 Location: West Yorkshire Posts: 8578
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It sounds like the system bought is something like an X-charge system from X-Eng or similar.
Have a read of X Eng instructions on www.foundry4x4.co.uk. Ignition fed live could also be taken from the back of the radio. Brendan |
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13th Jan 2014 9:26am |
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| 110dc Member Since: 12 Jan 2014 Location: wiltshire Posts: 9
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It's something I've made up from parts sourced from eBay. Thinking about it I will probably try and use the feed for heated windscreen as that only works while engine is running
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13th Jan 2014 8:26pm |
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