TLicense Posted February 4, 2007 Share Posted February 4, 2007 Perhaps someone can help me. I picked up a UK resistor pack from Mr T yesterday, and need to sort out a connector to hook it up. I've got a deal with Lemo so that I get free connectors through work, but to specify which one, I'm going to need the current and voltage that the connector is going to see. Can anyone help me here? Cheers, Quote Link to comment Share on other sites More sharing options...
TLicense Posted February 4, 2007 Author Share Posted February 4, 2007 OK I've managed to find that the voltage is between 9-14V. It's also running on the supply that has Fuse AM2 (30Amp) on it, but I don't think the current draw of the injectors is going to be as high as that? In fact I'm struggling to find any connectors at all that can cope with a 30 amp current. Any suggestions anyone? Quote Link to comment Share on other sites More sharing options...
jagman Posted February 4, 2007 Share Posted February 4, 2007 I would suggest using a quick release singlewire connector,one on each wire,they are small,easy to fit,sealed water/fuel/heat proof ,use gold pins and sockets for minimum resistance,rated at about 20amps but I doubt you would require that much. the best bit is that they are quick release and should be used in the whole car wiring. I may have some in my tool box that I can send you ,left over from my aircraft days,if not I can ask some old mates if they can"relocate"some from stores for me. I guess that you would need around 16-18 gauge size Quote Link to comment Share on other sites More sharing options...
TLicense Posted February 4, 2007 Author Share Posted February 4, 2007 rated at about 20amps but I doubt you would require that much. This is the problem. Trying to find what current they really need to rated to. I can get a single connector for each lead, f.o.c. from work, but they don't seem to do a multi-plug connector rated that high. Quote Link to comment Share on other sites More sharing options...
jagman Posted February 4, 2007 Share Posted February 4, 2007 30 amp on each pin would be a very large connector ,and look crap,I doubt each injector would take anywhere near that,there are connectors with just one or two higher power pins and the rest more normal ratings ,if only the supply line has to be 30 amps Quote Link to comment Share on other sites More sharing options...
jagman Posted February 4, 2007 Share Posted February 4, 2007 the cable size to each injector as standard would give you an idea of the current draw,I suspect 18-20 guage is used and no more that a few amps used on each Quote Link to comment Share on other sites More sharing options...
TLicense Posted February 4, 2007 Author Share Posted February 4, 2007 I would suggest using a quick release singlewire connector,one on each wire,they are small,easy to fit,sealed water/fuel/heat proof ,use gold pins and sockets for minimum resistance,rated at about 20amps but I doubt you would require that much. the best bit is that they are quick release and should be used in the whole car wiring. I may have some in my tool box that I can send you ,left over from my aircraft days,if not I can ask some old mates if they can"relocate"some from stores for me. I guess that you would need around 16-18 gauge size Based on that I'll get 7 of these ordered up:- Plug:http://www.lemo.com/display_product_detail_html.do?partNum=FFA1S130CTAC27 Receptacle: http://www.lemo.com/display_product_detail_html.do?partNum=PCA1S130CTLC52 Quote Link to comment Share on other sites More sharing options...
TLicense Posted February 4, 2007 Author Share Posted February 4, 2007 the cable size to each injector as standard would give you an idea of the current draw,I suspect 18-20 guage is used and no more that a few amps used on each Ahh OK cool, so each wire will be about 0.75mm dia right? That would make a lot more sense! Quote Link to comment Share on other sites More sharing options...
jagman Posted February 4, 2007 Share Posted February 4, 2007 from what I can find injector current draw is typically less than 1 amp.and of course not a constant current but pulse ,but if a injector fails its current draw can go ten times higher and that is probably why such a large supply fuse is used -for a fail situation. If you had a failed injector I think you would have more things to worry about than the connector failing! that connector would be fine although I am not a fan of soldered connectors-Ive burnt my fingers too many times Quote Link to comment Share on other sites More sharing options...
TLicense Posted February 4, 2007 Author Share Posted February 4, 2007 I think this would be better. 1 off of this for the outputs Plug: http://www.lemo.com/display_product_detail_html.do?partNum=FGG2B306CLAD62 Receptacle: http://www.lemo.com/display_product_detail_html.do?partNum=PHG2B306CLLD62 And one of the ones I posted above for the input. What do you recon? Quote Link to comment Share on other sites More sharing options...
jagman Posted February 4, 2007 Share Posted February 4, 2007 that would be cool.6 pin/20 guage and although the rating is 12amp it is a continious rating which will tolerate 3 times that for a short period as part of its rating process-so more that plenty Quote Link to comment Share on other sites More sharing options...
paul mac Posted February 4, 2007 Share Posted February 4, 2007 tony i did this a while ago on my home made resistor pack, but for the life of me cannot remember the current draw, all this talk of amps ! one thing i am certain of is the current was milli amp (16 Ma at 100% throttle seems to spring to mind), it is a peice of p**s to find current, if you cannot get hold of a clamp meter a lot of multi meters have amps, all you need to do is snip an injector wire and connect the meter in series, FYI i used the male female connectors for RLTC purchased direct from RLTC for about £11, i used the male female combination so i could "plug" the resistor pack out in the event of problems, been working fine for a year and a half Quote Link to comment Share on other sites More sharing options...
TLicense Posted February 4, 2007 Author Share Posted February 4, 2007 Cheers Paul, the problem is though that my car is in bits until I can get this connector sorted! IYSWIM Are you sure it was milli-amps though? That would make a BIG difference to the connector I can use. Quote Link to comment Share on other sites More sharing options...
paul mac Posted February 4, 2007 Share Posted February 4, 2007 Cheers Paul, the problem is though that my car is in bits until I can get this connector sorted! IYSWIM Are you sure it was milli-amps though? That would make a BIG difference to the connector I can use. sorry if i was teaching you to suck eggs tony, pretty sure it was milli amp, i can get the RS part number for the resistors i used if thats any good as i dont want to start hacking into the loom again Quote Link to comment Share on other sites More sharing options...
TLicense Posted February 4, 2007 Author Share Posted February 4, 2007 sorry if i was teaching you to suck eggs tony, pretty sure it was milli amp, i can get the RS part number for the resistors i used if thats any good as i dont want to start hacking into the loom again No not at all mate. I really know feck all when it comes to electrics. It's my one weakness really. I figured it was in the amp range because the fuse that it runs off of is 30A according to the wiring diagram. I just thought though, is that just the feeds to the injectors that could be milli-amp, and not the input into the resistor pack? Quote Link to comment Share on other sites More sharing options...
paul mac Posted February 4, 2007 Share Posted February 4, 2007 No not at all mate. I really know feck all when it comes to electrics. It's my one weakness really. I figured it was in the amp range because the fuse that it runs off of is 30A according to the wiring diagram. I just thought though, is that just the feeds to the injectors that could be milli-amp, and not the input into the resistor pack? i'll have a look at the resistors tommorow, drunk to much red tonight Quote Link to comment Share on other sites More sharing options...
Digsy Posted February 5, 2007 Share Posted February 5, 2007 Its a resitor pack in series with the injector, so you can work out the maximum current draw using Ohm's Law. Current (I) = V (14V max) / R (resistor pack + injector) If you know the R of the resistor pack and the injector combined then you can work out the maximum current draw. Quote Link to comment Share on other sites More sharing options...
TLicense Posted February 5, 2007 Author Share Posted February 5, 2007 Cheers Digsy, I was thinking the same whilst lying in bed last night (rock and roll lifestyle I know!) Anyway it works out about 2amps. Quote Link to comment Share on other sites More sharing options...
paul mac Posted February 5, 2007 Share Posted February 5, 2007 Cheers Digsy, I was thinking the same whilst lying in bed last night (rock and roll lifestyle I know!) Anyway it works out about 2amps. just looked at the resistors Tony and its coming back to me now my heads clear of red wine, i used 10w metal cased resistors (on a sexy ally heat sink) which i recall could have done with being a tad bigger (i think they do a 16w), this equals around 80 mA i knew i defo did not get more that this at 100% throttle, they have been running fine for about a year and half and show no sign of excess heat, anyway i think you've answered your own question as 2 amp would be more than enough Quote Link to comment Share on other sites More sharing options...
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