pug7 Posted April 3, 2017 Share Posted April 3, 2017 has anyone fitted a battery master switch recently to a sigma powered 7? Nothing in the manual about what wires where, and the guide under how to doesn't tie in to my cars wiring either.the main terminals in the BMS is straight forward one to the battery other to starter solenoid. I've no other wires to the battery +ve (how to guide says there's brown wires to it), on the bms there's 4 spade fittings two marked with a 1 and 2 marked with a 2. Anyone any clues what should go where? The kit on the caterham site shows four new coloured wires white brown black green hut no clues as to where they should connect and the resistor which goes from the bms to chassis,any clues be great ! My ignition has a white + white/ red together, a red , a white/green, brown + brown blue together and two whites together. Link to comment Share on other sites More sharing options...
Member Jonathan Kay Posted April 3, 2017 Member Share Posted April 3, 2017 Do you have a wiring diagram for your car? If you'd like one please send me a Private Mail with your email address and the year, engine and type of dash.The "standard" wiring colours might also help you to identify what you've got.Jonathan Link to comment Share on other sites More sharing options...
pug7 Posted April 4, 2017 Author Share Posted April 4, 2017 Thanks Jonathan. It's not so much what's in the car as what should be connected to the bms as all I have is a switch in a box an no clues at all. I've tried the how to section on here, and google searches, but they all seem to mention disconnecting two brown wires from the battery +vet connect them together to the bms with new lead, the only brown one I can find is on the starter solenoid with the main +be from the battery so it may as well stay put.It's an may 2012 7SV 1.6 sigma 125jp tweaked by caterham to 140 hp it's just the big standard dash I didn't ask for anything so whatever it came with, I've got the standard wiring diagram from the caterham build, that shows battery master switch as just a small circle with its label and WP187 and 40 next to it, with only one wire with 250 on it.im happy to take the main +ve off the battery and connect to one side of the bms and the new lead from bms to battery. I think the resister goes terminal 1 on bms to chassis. But I'm not sure what if anything needs connecting, I think the two white leads need to come off the ignition switch to on every of the bms terminals but not 100% sure which one, nor I'm 100% sure that's it. I just don't want to risk blowing the alternator etc...shame caterham backup is useless selling stuff with no diagrams etc. Yes I'm chasing them but no info so far just want to get the car modified. Link to comment Share on other sites More sharing options...
Member Jonathan Kay Posted April 4, 2017 Member Share Posted April 4, 2017 If you start with this thread which leads to this blog does that help?Jonathan Link to comment Share on other sites More sharing options...
pug7 Posted April 4, 2017 Author Share Posted April 4, 2017 yup done that one, i have two white wires to the ignition switch, the blog is for one that has no white wires. i seem to have two white wires onto one pin of the ignition barrel, and also a white and white/red together on the ignition barrel and a brown with a brown/blue together so 3 sets of paired connections... Link to comment Share on other sites More sharing options...
Member Jonathan Kay Posted April 4, 2017 Member Share Posted April 4, 2017 I'm sorry but I don't think that I can do this from the wire colours without one in front of me... can you work out the function of each of those from what you have?Jonathan Link to comment Share on other sites More sharing options...
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