Green200tdi Posted August 13, 2023 Share Posted August 13, 2023 Thinking of using one of these trip fuses on the circuit between the battery and fuse box (TD5) under the drivers seat 50 amp should be ok? also bit of added security when I leave the car if need be. Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted August 13, 2023 Share Posted August 13, 2023 Suspect 50A won't be nearly enough I'm afraid... Depending on what equipment you have fitted. Heated rear window can be 20-30A by itself, headlamps 10A, heater 10A, ecu/engine 10A... And that's just off the top of my head, there will be a lot more. 1 Quote Link to comment Share on other sites More sharing options...
ped Posted August 13, 2023 Share Posted August 13, 2023 i run a 50a for my fishing power barrow (wheel barrow with motor axle from a disability scooter) so i'd expect you'd need at least 100a Quote Link to comment Share on other sites More sharing options...
Green200tdi Posted August 13, 2023 Author Share Posted August 13, 2023 2 hours ago, Bowie69 said: Suspect 50A won't be nearly enough I'm afraid... Depending on what equipment you have fitted. Heated rear window can be 20-30A by itself, headlamps 10A, heater 10A, ecu/engine 10A... And that's just off the top of my head, there will be a lot more. I’ve just got standard lights no heated rear window, we’ll not one that works anyway 😂no electric seats ect it’s a td5 loom in a c reg 110 Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted August 13, 2023 Share Posted August 13, 2023 Even so, 50A seems rather light. Quote Link to comment Share on other sites More sharing options...
Green200tdi Posted August 13, 2023 Author Share Posted August 13, 2023 Just now, Bowie69 said: Even so, 50A seems rather light. Just found this ………😊 Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted August 13, 2023 Share Posted August 13, 2023 I'd start by wanting to know what the battery to fuse box wire is rated to, otherwise 200A may just allow it all to catch fire happily while not blowing. 1 Quote Link to comment Share on other sites More sharing options...
AlWorms Posted August 13, 2023 Share Posted August 13, 2023 46 minutes ago, Bowie69 said: I'd start by wanting to know what the battery to fuse box wire is rated to, otherwise 200A may just allow it all to catch fire happily while not blowing. ^^^This. Fuses are to protect the wiring, so need to be rated to suit. The fuse has to blow before the wiring becomes a mini arc welder, or simply melts and catches fire. The battery in my car uses a cable capable of 800 Amps, but uses a 300amp fuse (It has the starter motor load on it) Be aware, that cheap fuses are carp - there is a You Tube video testing them - I just take used ones from breaker cars. This isn't the video I was looking for, but same outcome: Quote Link to comment Share on other sites More sharing options...
Green200tdi Posted August 13, 2023 Author Share Posted August 13, 2023 (edited) Ok so it’s a bad idea? this wire is ignition only as have main feed to starter The battery in my car uses a cable capable of 800 Amps, but uses a 300amp fuse (It has the starter motor load on it) please don’t worry about stuff off eBay my car has never caught fire britpart parts have never fallen apart I’m still here after 20 years of eBay buying 😂😂 Edited August 13, 2023 by Green200tdi Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted August 14, 2023 Share Posted August 14, 2023 No, but no point fusing something higher than the cable is rated, it's not fused then, is it.... 1 Quote Link to comment Share on other sites More sharing options...
miketomcat Posted August 14, 2023 Share Posted August 14, 2023 Your alternator is likely to be 60-100 amps so that's a theoretical start point. Even if you add up all the current fuses on the wire you have in mind I suspect you'll go above 50 amps. Fridge freezer did a cable calc that might help. https://fuddymuckers.co.uk/tools/cablecalc.html Mike Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted August 14, 2023 Share Posted August 14, 2023 The point is there's no point having a 200A fuse on a cable that will already be on fire at 100A. Also I've heard those switch-breaker things can be quite badly made - honestly I would only be buying fuses/breakers from legit sources (made by the likes of Littelfuse or Bussman or Tyco) or scrap cars, anything cheap from ebay/Amazon/Aliexpress/etc. is as likely to start a fire as it is to save you from one. This might be the video @AlWorms was thinking of, it shows the issue quite clearly: 1 Quote Link to comment Share on other sites More sharing options...
Green200tdi Posted August 14, 2023 Author Share Posted August 14, 2023 8 hours ago, FridgeFreezer said: The point is there's no point having a 200A fuse on a cable that will already be on fire at 100A. Also I've heard those switch-breaker things can be quite badly made - honestly I would only be buying fuses/breakers from legit sources (made by the likes of Littelfuse or Bussman or Tyco) or scrap cars, anything cheap from ebay/Amazon/Aliexpress/etc. is as likely to start a fire as it is to save you from one. This might be the video @AlWorms was thinking of, it shows the issue quite clearly: These are what I call Christmas present from the mother in law or sister in law go stright in bin same day like screw drivers 😂 2 Quote Link to comment Share on other sites More sharing options...
AlWorms Posted August 14, 2023 Share Posted August 14, 2023 10 hours ago, FridgeFreezer said: This might be the video @AlWorms was thinking of, it shows the issue quite clearly: Yes! Thanks! it's very scary! Quote Link to comment Share on other sites More sharing options...
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