Date registered: Feb 2010
Vehicle: 1972 280SEL daily driver. 904 Dark Blue with cognac interior. euro 4.5 engine
Location: Williamsburg, VA
Mentioned: 3 Post(s)
Quoted: 36 Post(s)
To test, you can run a hot wire direct from the battery to the coil. I wouldn't do this for long (a minute or so). That would tell you if it is upstream (ie. no power during cranking) or downstream (ie. an issue in the hotspark).
You said the starter is new? Did you replace it prior to or after the continuous cranking incident?
From the HotSpark manual "you can, for temporary testing purposes only, run a wire directly from the battery's + terminal to the coil's +
terminal, the Hot Spark ignition's red wire to the coil's + terminal and the black Hot-Spark wire to the coil's - terminal.
Do not leave the wire from the battery connected to the coil's + terminal for more than a minute or so without the