Benzworld.org - Mercedes Benz Discussion Forum - View Single Post - Scott at Expedition Imports - I'm having trouble with my 404 Civi Conversion Kit

Two Tone · 05-18-2008, 11:37 AM

Thanks graphic66.

I found some specs for the 40611 that state primary resistance should be 3.0 ohms and secondary resistance should be 8.5k ohms. Those are the exact values I get when I test the coil.

I checked the original Bosch coil: Primary 6.0 ohms, Secondary 11.5k ohms.

I replaced the Flamethrower with the Bosch and the truck runs perfectly again so it would seem that although the Flamethower is up to the resistance specs there's still something wrong with it.

The post ballast voltage is still 25+ so I'm guessing my ballast went bad and the over voltage ruined the Flamethrower coil. I got a resistance of 4.5 ohms across the ballast which is .4 lower than 63TLF8's measurement of 4.9 on his ballast. Not sure if that is a significant difference or not.

Scott, I'll be placing an order for another coil and a new ballast resistor right away. Thanks for the time and help.

If anybody has more input feel free.

I'll update when I install the new coil and ballast.

05-18-2008, 11:37 AM	#18 (permalink)
Two Tone BenzWorld Member Date registered: Dec 2007 Vehicle: 1969 Swiss 404 - 1977 Porsche 911 S Location: Nova Scotia, Canada Posts: 102	Scott is right, it's the coil Thanks graphic66. I found some specs for the 40611 that state primary resistance should be 3.0 ohms and secondary resistance should be 8.5k ohms. Those are the exact values I get when I test the coil. I checked the original Bosch coil: Primary 6.0 ohms, Secondary 11.5k ohms. I replaced the Flamethrower with the Bosch and the truck runs perfectly again so it would seem that although the Flamethower is up to the resistance specs there's still something wrong with it. The post ballast voltage is still 25+ so I'm guessing my ballast went bad and the over voltage ruined the Flamethrower coil. I got a resistance of 4.5 ohms across the ballast which is .4 lower than 63TLF8's measurement of 4.9 on his ballast. Not sure if that is a significant difference or not. Scott, I'll be placing an order for another coil and a new ballast resistor right away. Thanks for the time and help. If anybody has more input feel free. I'll update when I install the new coil and ballast. __________________ Two Tone ______ Reading the instructions - a sure sign of weakness and uncertainty. Last edited by Two Tone : 05-18-2008 at 11:49 AM.