wiring this way okay? |
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Jack1991
Registered User Joined: 05 February 2020 Location: Bristol Status: Offline Points: 495 |
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Posted: 16 February 2020 at 9:54am |
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Thank you mate that is an absolutely perfect explanation. And thankyou ginger_biscuit too makes sense now. 🙂👍🏼
Edited by Jack1991 - 16 February 2020 at 9:55am |
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JonB67
Young Croc Joined: 22 April 2016 Location: UK Status: Offline Points: 1376 |
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Its easier to understand what you're doing is right if you know why you're doing it.
Basically you shouldn't have leads from the battery terminal that dont have fuses on them (as biscuits has said, close to the terminal) If you do and it touches anything or the sheathing gets cut or a component failure etc, there's nothing to stop the battery trying to put all its stored energy through the cable,. Things get hot and fires start. So if you wire the units one after the other as your diagram, one fuse is fine. If you put a second feed for the hu or something else on as biscuits suggests you could, that also needs a fuse close to the battery. Every cable needs a fuse. If you take power from a point that's already got a fuse somewhere between the point you're taking power from and the battery that's ok, if not you need to add a new fuse. I know I've basically said what's been said already, but id rather you understood what you're doing than just did it because we said it was fine. Less likely to make mistakes if you can think it through for yourself. Edit for clarity of terminology!
Edited by JonB67 - 16 February 2020 at 9:32am |
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mk2_ginger_biscuit69
Old Croc Joined: 03 November 2008 Location: Brighton Status: Offline Points: 7801 |
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to clarify, you need a fuse immediately post battery on the supply - before the amplifier.
my HU fuse comment related to having a link from amp to HU. Long as the initial fuse prevents the battery dumping its capacity on a short - essentially being a welder, all is well. |
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Jack1991
Registered User Joined: 05 February 2020 Location: Bristol Status: Offline Points: 495 |
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Cool perfect thank you! Want to make sure i dont f it up. Cheers guys 👍🏼
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JonB67
Young Croc Joined: 22 April 2016 Location: UK Status: Offline Points: 1376 |
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Yes, that's fine.
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Xoc1
Registered User Joined: 15 October 2012 Location: Devon UK Status: Offline Points: 397 |
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It will be OK but unnecessary as previously said
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Jack1991
Registered User Joined: 05 February 2020 Location: Bristol Status: Offline Points: 495 |
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Would a inline fuse on the head unit positive cable be ok?
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Jack1991
Registered User Joined: 05 February 2020 Location: Bristol Status: Offline Points: 495 |
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So to clarify this way would be 100% fine? If not someone please let me know what i would need to do
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JonB67
Young Croc Joined: 22 April 2016 Location: UK Status: Offline Points: 1376 |
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As his diagram, the hu internal fuses are downstream of the inline fuse which, as you rightly point out, would ideally be close to the battery. Its also good practice to check all the cable routing to identify potential chaffing and protect the cable where needed.
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Jack1991
Registered User Joined: 05 February 2020 Location: Bristol Status: Offline Points: 495 |
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right ok so this was would be 100% then? I dont need or should have anything else to add? The inline fuse would be the one supplied with the amplifier wiring kit. And be fitted within 1ft of the battery
This is NOT in a car by the way. Its just going to be a off grid 12v sound system.
Edited by Jack1991 - 12 February 2020 at 6:43pm |
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godathunder
Old Croc Joined: 19 July 2004 Location: wicklow Status: Offline Points: 1834 |
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Id want a fuse as close to the battery terminal as possible. relying on the equipments internal fuses offers no protection in case of damage to the supply cable. whilst it possibly seems ott, its is a plausible danger. Actual real life, yes it did actually happen, example below: A friends car burst into flame outside his house (nearly took the house with it). it was a taxi and the mate that had installed his taxi meter for him had tapped the supply directly from the battery. there was an inline fuse but it was quite far downstream. the positive cable became chafed over time and shorted against the chassis. cue dead short with no protection and goodbye car |
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Jack1991
Registered User Joined: 05 February 2020 Location: Bristol Status: Offline Points: 495 |
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Cool okay thank you.
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