GasWorksGarage Posted March 17, 2017 Share Posted March 17, 2017 we recently got a 1909 open touring in our collection. The battery box has all but 2 wires missing. The 2 that run from magneto switch to the magneto. the rest are missing. Anyone have or know where I could find a diagram? Thanks Link to comment Share on other sites More sharing options...
Layden B Posted March 17, 2017 Share Posted March 17, 2017 During that period most wiring diagrams are not auto make specific but rather make of electrical equipment. What make/model of switch/coil and magneto do you have? Link to comment Share on other sites More sharing options...
GasWorksGarage Posted March 17, 2017 Author Share Posted March 17, 2017 Hello, Switch is a Jacobson-Branoow. Mag is American Bosch - MJB4A-104 Link to comment Share on other sites More sharing options...
Layden B Posted March 17, 2017 Share Posted March 17, 2017 I am thinking that Jacobson-Brandow made coil boxes that worked with a timer. Your Bosch magneto dates from 20 years after the car so perhaps is a replacement for the timer. Can you post pictures of your equipment? Link to comment Share on other sites More sharing options...
GasWorksGarage Posted March 17, 2017 Author Share Posted March 17, 2017 Would this magneto start the car by hand crank or would it still need battery power? Link to comment Share on other sites More sharing options...
Layden B Posted March 18, 2017 Share Posted March 18, 2017 Your existing coil box appears similar if not identical to units used on Model T Fords. If so, the engine side would be laid out like this Kingston unit. the Ford diagram would apply. Note that your engine would have a timer wired to the coil box, a typical timer is pictured. The wiring diagram shows 1911 Hudson with a special coilbox that controls both that box and a magneto. The idea is to start on coils using a battery then switch over and run on the magneto. Your existing magneto with start the engine if you crank fast enough, it is not capable of making spark from battery power. The idea in the old days was to prime the engine, then turn on a battery powered system that would spark the plugs thereby starting the engine with not hand cranking needed. I am going to guess that your engine has 2 sets of spark plugs. What does the engine side of the coilbox look like? Link to comment Share on other sites More sharing options...
wac Posted June 23, 2017 Share Posted June 23, 2017 Assuming the car was running with the wiring as received, the (after-market) magneto is "high tension" and the two wires to the switch are to ground the mag to kill the ignition. A high tension magneto requires no battery and has no external coil. Link to comment Share on other sites More sharing options...
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