If you wire the two filaments in parallel with each other the combined resistance will be less than that of the filament with the least resistance - resulting in a current demand that is higher than normal. This will cause a bright light but may cause an overheating problem with the wires.<br /><br />If you wire the two filaments in series with each other the combined resistance will be the sum of the resistances of the two filaments - resulting in a current demand which will be quite low. This will cause a very dim light.<br /><br />It would be best to just light one filament.<br /><br />Art Braundmeier<br /><br /><div style="font-family: "Times New Roman"; font-size: 16px;"><br /><br /><span>On 07/20/15, <b class="name">Simon Lachlan </b> <simon.lachlan@homecall.co.uk> wrote:</span><blockquote cite="mid:008e01d0c337$8e1b5d40$aa5217c0$%lachlan@homecall.co.uk" class="iwcQuote" style="border-left: 1px solid #00F; padding-left: 13px; margin-left: 0;" type="cite"><div class="mimepart text html"><span xmlns="http://www.w3.org/TR/REC-html40" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:v="urn:schemas-microsoft-com:vml" xmlns:w="urn:schemas-microsoft-com:office:word"><p><meta content="text/html; charset=us-ascii" http-equiv="Content-Type" /><meta content="Microsoft Word 12 (filtered medium)" name="Generator" /><style><!--
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</o:shapelayout></xml><![endif]--><table><tbody><tr><td lang="EN-GB" link="blue" vlink="purple"><p></p><div class="WordSection1"><p class="MsoNormal"><span style="color:#1F497D">Our Series 2 Landrovers had them. Those were army vehicles but I’d guess they were pretty much the same as civilian ones. (I know; I had dozens of the things).<o:p></o:p></span></p><p class="MsoNormal"><span style="color:#1F497D">Simon<o:p></o:p></span></p><p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p><div><div style="border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm"><p class="MsoNormal"><b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Healeys [mailto:healeys-bounces@autox.team.net] <b>On Behalf Of </b>Herbert Miller<br /><b>Sent:</b> 20 July 2015 22:12<br /><b>To:</b> healeys@autox.team.net<br /><b>Subject:</b> [Healeys] German spec BT7<o:p></o:p></span></p></div></div><p class="MsoNormal"><o:p> </o:p></p><p class="MsoNormal"><span lang="EN-US">I have a 1961 German spec BT7 that I am restoring. As you may know , the German spec BT7,s had separate single filament lamps for side a signal lamps. The rear also had separate single filament lamps for signal and brake lights. As separate single filament lamp holders are found on no other Healey’s or Sprites and BJ8 lights are completely different, I need some single filament lamp holders. Anyone know of any other cars of the period that used these. Plan B is to use duel filament holders, and wire both filaments together for extra brightness. Anyone see a problem with this?<o:p></o:p></span></p><p class="MsoNormal"><span lang="EN-US">Thanks in advance.<o:p></o:p></span></p><p class="MsoNormal"><span lang="EN-US">Herb Miller<o:p></o:p></span></p><p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p></div></td></tr></tbody></table></p></span></div></blockquote></div>