Lewis Posted January 22, 2007 Share Posted January 22, 2007 I bought an FIA engine cut off switch off ebay for the 110, like this one, and wired it up as per the diagram that it comes with. After ~2minutes connected but with the key out the 5ohm 11watt resistor that comes with the switch had gotten very hot - it had melted the cable tie that i had used to secure it. Even after 5mins it had barely cooled enough to handle. Are they supposed to get this hot, and if so how has everyone else mounted them so as not to melt anything else? Otherwise, have i made an obvious mistake with my electrickery or is it a faulty unit? Thanks in advance Lewis Quote Link to comment Share on other sites More sharing options...
Jon White Posted January 22, 2007 Share Posted January 22, 2007 Did you have the engine running, or anything else running?? The idea is that the kill switch also cuts the ignition so the engine stops! The resistor is only supposed to be there to prevent damage to the alternator when you turn the key off. Jon Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted January 22, 2007 Share Posted January 22, 2007 Those resistors can dump a lot of heat, it's why they're ceramic. Got the wiring diagram as (almost) seen on the eBay page? Quote Link to comment Share on other sites More sharing options...
Lewis Posted January 22, 2007 Author Share Posted January 22, 2007 Did you have the engine running, or anything else running??Jon No, the engine was off, and when i disconnected the main live there was no spark, indicating that there were no open circuits. however the earth from the resistor did spark when i connected it to ground. Got the wiring diagram as (almost) seen on the eBay page? Yep, thats the exact switch in the picture and the diagram that it came with Lewis Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted January 22, 2007 Share Posted January 22, 2007 Yep, thats the exact switch in the picture and the diagram that it came with Fancy sharing it with the rest of us? Quote Link to comment Share on other sites More sharing options...
Lewis Posted January 22, 2007 Author Share Posted January 22, 2007 Oh, sorry, bit dim witted today, the diagram is some 60plus miles away and i wont be back there at the workshop until the weekend, I'll have a quick go on paint and see what i can do Here goes: A) Batt +ive (big terminal) B ) +ive to engine (big terminal) 1) ignition feed 2) +ive to coil 3) Batt +ive 4) Earth through 5ohm 11watt resistor Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted January 22, 2007 Share Posted January 22, 2007 Careful with the crayons, I'm banned from using them after last time Quote Link to comment Share on other sites More sharing options...
Mark90 Posted January 22, 2007 Share Posted January 22, 2007 My guess is the two big connections on the 10mm studs are the wrong way round. When the switch is off one of these is connected to the resistor that's connected to earth. The one that connects through to the resistor should be the engine side. Sounds like you have the battery live side connected to the stud that connects to the resistor in the off position, so your battery is discharging through the resistor. And in response to "Are they supposed to get this hot?" No. They should only take any current when you switch the FIA switch off with the engine running as it dumps any voltage in the system to earth through the resistor. Quote Link to comment Share on other sites More sharing options...
Lewis Posted January 22, 2007 Author Share Posted January 22, 2007 Careful with the crayons, I'm banned from using them after last time I got banned from using wax crayons in me english GCSE lessons because my mate told everyone that i liked to eat them Quote Link to comment Share on other sites More sharing options...
Lewis Posted January 22, 2007 Author Share Posted January 22, 2007 My guess is the two big connections on the 10mm studs are the wrong way round.When the switch is off one of these is connected to the resistor that's connected to earth. The one that connects through to the resistor should be the engine side. Sounds like you have the battery live side connected to the stud that connects to the resistor in the off position, so your battery is discharging through the resistor. And in response to "Are they supposed to get this hot?" No. They should only take any current when you switch the FIA switch off with the engine running as it dumps any voltage in the system to earth through the resistor. Hmm, that sounds likely, i'll give it a try at the weekend. Thanks Mark I've usually found that the response to any "should it get this hot?" question is a resounding no! Lewis Quote Link to comment Share on other sites More sharing options...
white90 Posted January 22, 2007 Share Posted January 22, 2007 Heres a copy of mine Quote Link to comment Share on other sites More sharing options...
reedx Posted January 22, 2007 Share Posted January 22, 2007 There's a copy of the diagram on this page. http://www.reedx.net/landrover/mods/batterycutoff/index.htm Quote Link to comment Share on other sites More sharing options...
Les Brock Posted January 22, 2007 Share Posted January 22, 2007 You take the feed to terminal 3 from the dead side of the switch in the off position(to alternator/starter) so any voltage spike from the alternator goes down to earth via the resistor on termonal 4 these contacts should close when the switch is turned off..but check the numbers, the other switch opens with the switch off If you take the feed from the battery side then that will go to earth via the resistor and get flammin' hot Quote Link to comment Share on other sites More sharing options...
will_warne Posted January 22, 2007 Share Posted January 22, 2007 On a Tdi what does the ignition coil terminal go to? Fuel cut off solinoid? P.S. Lewis, I have tea all over my key board because of this: I got banned from using wax crayons in me english GCSE lessons because my mate told everyone that i liked to eat them Quote Link to comment Share on other sites More sharing options...
Mark90 Posted January 22, 2007 Share Posted January 22, 2007 Yep Quote Link to comment Share on other sites More sharing options...
Gremlin Posted January 23, 2007 Share Posted January 23, 2007 I had the same problem, i just ditched the resistor and used one side to switch the coil on my buggy, works a treat! No problems till this day. Grem Quote Link to comment Share on other sites More sharing options...
white90 Posted January 23, 2007 Share Posted January 23, 2007 well according to the diagram I posted you have it wired wrong Quote Link to comment Share on other sites More sharing options...
Lewis Posted January 23, 2007 Author Share Posted January 23, 2007 P.S. Lewis, I have tea all over my key board because of this:I got banned from using wax crayons in me english GCSE lessons because my mate told everyone that i liked to eat them Quite what wax crayons were doing in an english GCSE lesson is beyond me well according to the diagram I posted you have it wired wrong Thats exactly the diagram that came with mine - I just remembered it wrong when i drew it thats all. But yes - i had wired it wrong - i seem to recall taking the live of the battery side rather than the engine side, oops Thanks everyone Quote Link to comment Share on other sites More sharing options...
white90 Posted January 23, 2007 Share Posted January 23, 2007 at least you didn't have a nice little warming fire afterwards Quote Link to comment Share on other sites More sharing options...
Lewis Posted January 23, 2007 Author Share Posted January 23, 2007 at least you didn't have a nice little warming fire afterwards It was very close though, i was just stopping to go inside for a cuppa after a job well done when i noticed lots of smoke in the cab , i'm not overly fussed about the car but it was blocked in by a mates 90 and its unlikely i could have gotten it out of the workshop quick enough to stop the fire spreading if it had gotten that far then we would have lost a lot more than the 110's dashboard Quote Link to comment Share on other sites More sharing options...
Andy Posted January 23, 2007 Share Posted January 23, 2007 so on the bright side we now have an answer to the often asked 'how do i get my defender warm inside?' question Quote Link to comment Share on other sites More sharing options...
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