Date registered: Sep 2012
Vehicle: 1972 Mercedes Benz 250
Location: Santa Fe, NM U.S.A.
Mentioned: 0 Post(s)
Quoted: 17 Post(s)
I installed the hot spark unit on my 1972 250. I had no issues with the unit and it was always another issue that was causing my woes. I can tell you some things that were giving me the headaches. First, I had an issue with the front carb fuel shut off solenoid not opening up so fuel was only getting to the back three cylinders. I could get the engine to start and idle, but as soon as i put the car in gear, the engine would stall out. Double check your fuel cut off sloenoids that they are operating correctly.
Next my rotor was not allowing any current through it. Visibly, it looked fine, but the meter showed no continuity. A new 5 dollar rotor fixed this problem. Keep in mind, the car would not start at all with the damaged rotor.
Second, the timing needs to be set to accommodate these electronic ignitions. You can not use the factory recommend settings.
and finally, just to make sure that the hotspark didnt get fried, go to their website and they tell you how to check it with a meter.
Don't ever give anyone a jump start with these ignitions hooked up. The best thing to do is to disconnect it from the coil, then let the dead car hook up to your battery and then start their engine, then disconnect the jumper cables, reconnect the hotspark to the coil then restart your engine.
Also, they DO NOT advise having the ignition on without starting the car for longer than a few minutes, doing this can fry the hot spark.
as CTAYLOR suggests, make sure the hotspark "magnet" is properly fitted onto the collar.
I almost forgot. make sure you also have the proper coil and ballast hooked up.
Good luck, keep us posted.
Last edited by Luna Gaudi's 72 250; 01-13-2015 at 11:16 AM.