dioliahary Posted December 21, 2014 Share Posted December 21, 2014 Is there any downsides from taking the power source from the alternator. This will feed the new headlights. Quote Link to comment Share on other sites More sharing options...
Retroanaconda Posted December 21, 2014 Share Posted December 21, 2014 Nope, that's where I took mine from - the battery connection bolt on the back of the alternator. Quote Link to comment Share on other sites More sharing options...
dioliahary Posted December 21, 2014 Author Share Posted December 21, 2014 Belting, saves me running a cable from the battery to the front of the engine bay. Quote Link to comment Share on other sites More sharing options...
oneandtwo Posted December 21, 2014 Share Posted December 21, 2014 If it's any help I bought a "boomslang" headlamp loom from paddocks. Really poor build quality, all the headlight crimps pulled off the wires with no effort. I ended up soldering up all the connectors. The wiring colours are complete opposite from their supplied wiring diagrams. They used blue for live feed and also earth connections! Quote Link to comment Share on other sites More sharing options...
stuck Posted December 21, 2014 Share Posted December 21, 2014 No, providing you fit an inline fuse Quote Link to comment Share on other sites More sharing options...
dioliahary Posted December 21, 2014 Author Share Posted December 21, 2014 Great stuff, going to make my own loom, using the existing loom to trigger relays with the lights drawing their power source from a fused supply from the alternator. Quote Link to comment Share on other sites More sharing options...
mmgemini Posted December 22, 2014 Share Posted December 22, 2014 I've posted my headlight up-grade on here and other forums many times. So please go to http://landytown.myfastforum.org/about7578.html For some reason it wouldn't copy and paste Quote Link to comment Share on other sites More sharing options...
dioliahary Posted December 22, 2014 Author Share Posted December 22, 2014 Thank you Quote Link to comment Share on other sites More sharing options...
Mo Murphy Posted December 22, 2014 Share Posted December 22, 2014 I've used the alternator as a source without problem too, H. Mo Quote Link to comment Share on other sites More sharing options...
Disco-Ron Posted December 23, 2014 Share Posted December 23, 2014 You could use the connection on the starter motor. ... bigger bolt and more direct to battery. .. That's what I did for my fans Quote Link to comment Share on other sites More sharing options...
reb78 Posted December 23, 2014 Share Posted December 23, 2014 Silly question time, but where is this bolt on the back of the alternator? Is it clearly marked? (I have the standard 45amp 200tdi alt) Quote Link to comment Share on other sites More sharing options...
western Posted December 23, 2014 Share Posted December 23, 2014 marked as D+ or Batt. Quote Link to comment Share on other sites More sharing options...
AMB Posted December 23, 2014 Share Posted December 23, 2014 The alternator bolt is the highest voltage take-off point in a running system. If you want maximum volts to your headlamps, that's where you connect. Richard - if you have bolt connections on the back of your alternator, it will be obvious, the heaviest gauge wiring to a connection usually marked as B+. However, depending on age etc you may have a three pin connector. Quote Link to comment Share on other sites More sharing options...
need4speed Posted December 23, 2014 Share Posted December 23, 2014 I dont follow. Why would the alternator feed provide a higher voltage than the starter feed?? Quote Link to comment Share on other sites More sharing options...
vulcan bomber Posted December 23, 2014 Share Posted December 23, 2014 Silly question time, but where is this bolt on the back of the alternator? Is it clearly marked? (I have the standard 45amp 200tdi alt) Your alt might not have it being just 45 amp and with the 3 spade plug on. One of the 65 amp alts on the 110 has either option..... Quote Link to comment Share on other sites More sharing options...
mmgemini Posted December 23, 2014 Share Posted December 23, 2014 There's a B big nut on the starter motor. Take the wiring from there. A shorter run. Quote Link to comment Share on other sites More sharing options...
Mo Murphy Posted December 23, 2014 Share Posted December 23, 2014 That's a longer run to the headlights Mike. Quote Link to comment Share on other sites More sharing options...
need4speed Posted December 23, 2014 Share Posted December 23, 2014 That's a longer run to the headlights Mike. Would that be the answer to my question above Mo? Quote Link to comment Share on other sites More sharing options...
Mo Murphy Posted December 23, 2014 Share Posted December 23, 2014 I'm confused now Mo Quote Link to comment Share on other sites More sharing options...
AMB Posted December 23, 2014 Share Posted December 23, 2014 I don't follow. Why would the alternator feed provide a higher voltage than the starter feed?? The alternator charges the battery. Anything and everything else has wiring in the way. Wiring equates to voltage drop, so the alternator output connection must be a higher voltage than at the battery. To get the most volts at the headlamps you need the lowest resistance point from the highest voltage in the system. On my 300Tdi installation the shortest run is from the alternator inside a convenient wiring loom. If I took it from the starter feed, it would be a longer run, albeit with the high current starter feed being very low resistance. Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted December 24, 2014 Share Posted December 24, 2014 Not to mention the inevitable voltage drops across connections of any sort. Light output drops with the square of the voltage drop, so a quarter less volts is half the light, this is why this upgrade works so well. Quote Link to comment Share on other sites More sharing options...
mmgemini Posted December 24, 2014 Share Posted December 24, 2014 That's a longer run to the headlights Mike. Nope. Take the mas8in feed to the relays from the starter to the left inner wing. That's a neat short way od doing it. The RH headlight has the longest run across the rad panel. You should see how Land Rover do it ??? Quote Link to comment Share on other sites More sharing options...
dioliahary Posted December 27, 2014 Author Share Posted December 27, 2014 Thanks for all your help, wired them in today with home made loom protected by split conduit, used the original loom to switch two relays fixed to the nearside inner wing, fused live from the alternator powering the new led headlights, tested belting. Quote Link to comment Share on other sites More sharing options...
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