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04-20-2020, 06:42 PM | #1 |
Getting Wild
Join Date: Oct 2009
Location: Winston-Salem,NC
Posts: 143
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Which Terminal on key switch
2006 Precedent. I have carefully(and successfully) installed a 48V to 12V converter. The output wires from the converter read 12V. As I prepare to run the wire to the dash, my question is which terminal on the key switch is the one to which I attach the wire? Also, do I need to disconnect the main pos/neg wires again to make this connection or is "tow" mode sufficient?
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04-20-2020, 06:59 PM | #2 |
Gone Wild
Join Date: Aug 2009
Posts: 14,245
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Re: Which Terminal on key switch
You want to attach the trigger wire to the 'cold' side of the key switch. Simply use your multimeter to determine which terminal only has 48v when the switch is on.
For safety, go ahead and disconnect one of the battery cables in addition to flipping the run/tow switch to tow. |
04-20-2020, 07:54 PM | #3 |
Getting Wild
Join Date: Oct 2009
Location: Winston-Salem,NC
Posts: 143
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Re: Which Terminal on key switch
By "cold" side, do you mean the terminal with zero voltage and wouldn't the other terminal have only 12V?
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04-20-2020, 08:10 PM | #4 |
Gone Wild
Join Date: Aug 2009
Posts: 14,245
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Re: Which Terminal on key switch
Which wire are you running to the dash, what is its purpose?
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04-20-2020, 08:33 PM | #5 |
MOD of all BS!
Join Date: Sep 2011
Location: Florida
Posts: 17,477
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Re: Which Terminal on key switch
And to Jakes point, is this the 48v supply wire or the trigger wire? You do not want to run the supply wire from the switch like some will do with small 4 wire converters.
If it has a trigger wire, that goes to the cold side of the switch. If it is a 48v supply wire, it goes to the pack Pos (+) and will be a hot (on) converter all the time or you need to run a 48v relay from it to the cold side of the switch. |
04-20-2020, 10:41 PM | #6 |
Gone Wild
Join Date: Jan 2017
Location: Queensland Australia
Posts: 1,332
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Re: Which Terminal on key switch
To clarify what Nole and Jake said we need to know if you have a 5-wire reducer or does it just have 4 wires?
If you have a 4 wire reducer:
If you don't have a multimeter to test which is the cold side just connect the trigger wire to one side and see if the reducer is off (no 12V) when the key is off. If not change the trigger wire to the other side. |
04-21-2020, 12:32 AM | #7 |
MOD of all BS!
Join Date: Sep 2011
Location: Florida
Posts: 17,477
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Re: Which Terminal on key switch
Yeah, what he said! Lol!!
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04-21-2020, 06:09 AM | #8 |
Gone Wild
Join Date: Dec 2010
Posts: 635
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Re: Which Terminal on key switch
Good Info
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04-21-2020, 07:48 AM | #9 |
Gone Wild
Join Date: Jan 2017
Location: Queensland Australia
Posts: 1,332
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Re: Which Terminal on key switch
A few things to add to what I said above:
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04-21-2020, 12:55 PM | #10 |
Getting Wild
Join Date: Oct 2009
Location: Winston-Salem,NC
Posts: 143
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Re: Which Terminal on key switch
Thanks yawood! I have a 5 wire reducer and my simple mind understands your connection instructions completely.
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