To: Volvo303@yahoogroups.com From: "windmywatch" Date: Wed, 25 Feb 2009 18:14:03 -0000 Subject: [Volvo303] Help with my LED taillight conversion on TGB 1111? Reply-To: Volvo303@yahoogroups.com Hi, I just swapped my incandescent tail lights for LED replcements (thru the off road source that i found on this forum) The lights look great, and seem to function properly, EXCEPT that whenever I turn on my blinker (left or right), both brake lights start flashing also, right along with the correct flasher side. I heard that this is a common problem, and that I need to add some kind of load simulator resistor to the flasher wire on each light. Can someone who has done the LED tail light conversion tell me what resistance value I need? And do I simply cut the flasher wire and install the load resistor in series, for each side (each tail light)? Any help would be great, as I cannot drive my TGB1111 until I get this sorted out (I am afraid I will get a ticket from police for brake lights flashing with turn signal on!) I can't be the only one who has done this LED tail light swap, and had this problem...:-) Incidentally, the reverse/backup light I also replaced, it works great, and is SO bright that it easily doubles as reverse spot lights!! Thanks! Jason To: Volvo303@yahoogroups.com From: "hilledegroot" Date: Wed, 25 Feb 2009 19:07:19 -0000 Subject: [Volvo303] Re: Help with my LED taillight conversion on TGB 1111? Reply-To: Volvo303@yahoogroups.com Goto: http://www.kmonkey.com/blog/trog/2008/06/30/cheezbrgr-update/ Good luck To: Volvo303@yahoogroups.com From: "hilledegroot" Date: Wed, 25 Feb 2009 19:09:21 -0000 Subject: [Volvo303] Re: Help with my LED taillight conversion on TGB 1111? Reply-To: Volvo303@yahoogroups.com Cheezbrgr update Update on the cheezbrgr lights. I had some flaky behaviour with the right turn signal not flashing when the running lights were on. It flashes fine when they are off, and the left turn signal works fine. The old Bosch mechanical flasher expects a certain current to flash. Apparently, it's right on the edge of oscillating, and (guessing) the internal switchmode power supply of the new cheezbrgers draws less flash current when the running lights are on. The fix for this was relatively simple. I added a 16 ohm 10 watt resistor from the flasher terminal to ground on the back of the cheezbrgr light. I added a resistor to the left signal as well, even though it isn't needed right now. These 10 ohm resistors from Radio Shack will also work http://www.radioshack.com/product/index.jsp?productId=2062291 For 24V systems, you want to use a 50 ohm resistor http://www.radioshack.com/product/index.jsp?productId=2062292 The next problem was the interior dashboard indicator lamps failed to flash, even though the external lamps were fine. This must be some sort of "dead bulb" detector in the Bosch flasher, for which the LEDs, even with the resistors, didn't draw enough current. It could be an inrush current thing. Incandescnt bubls have a very low resistance when first turned on. As the filament heats the resistance increases. The fix was relatively easy. I put each indicator lamp in the same circuit as the external flashers. There are three three-way connectors behind the dash which distribute the flasher circuit. They are the only three way connectors behind the dash. On Trög one feeds two green wires, another feeds two red wires and a third feeds two yellow wires. The yellow wires are the input to the flasher circuit (it unions the flasher and the hazard lights). The other two, red and green ones are the ones you want to hijack. For each of the red and green, I removed the female spade terminal from the feed wire to the three-way connector and crimped on a new connector to the old wire, along with a new wire. That new wire was then fed to the indicator lamp. On the electrical diagram I have, I connected the two three way connectors below Item 49 to Items 36 and 38 (red, green lines), and disconnected the original feed wires to 36 and 38 (orange slash). It all works great now! Another fix would be to source a modern electronic flasher which is pin-compatible with the old Bosch flasher. I couldn't find one in my searches and the surgery above wasn't difficult at all. This entry was posted on Monday, June 30th, 2008 at 8:59 pm and is filed under Trog. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site. 3 Responses to "Cheezbrgr update" Christian Brudevoll says: 30 June 2008 at 10:20 pm I'll adwice you to mount a resistance on the left rear flasher as well. It might be simple luck that the left one works without problem. So by mounting a restistance there, you might avoid getting problems in the future. wesc says: 1 July 2008 at 6:42 am Thanks. I put a resistor on the left light as well. I updated the text above to indicate that. Joyce says: 10 July 2008 at 7:48 am Looks like your degree in electrical engineering has finally paid off.