Posted by Janicholson on November 06, 2011 at 08:04:41 from (96.24.99.126):
In Reply to: Elementary Electrical posted by equeen on November 06, 2011 at 05:21:11:
John has your #1 terminal covered (as he is as good as we get on this issue! The Ignition switches (on off) are non specific as to terminals. Neither is grounded, so it makes no difference. One comes from the amp meter load side. one has the ignition resistor (if used) and the wire going to the diode/lamp/15ohm resistor then terminal 1 on the Alt. A diesel on off switch is grounded and has only one screw terminal. I believe in putting a fusable link in the electrical system protecting the alternator from total melt down if a mistake is made jumping or a short happens. This fuse link is a fuse wire available from auto parts stores it will have (and needs) metal connectors on its ends (spade terminals or such) to place it in the circuit. It is located on the starter switch, and is in the 10 gauge wire supplying the amp meter with connection to Positive from the battery. (assumes you are using Delco Alternator or Hitachi with negative ground as in a modern car) The amp meter needs to be wired so it shows discharge when the lights are on. (easily tested when connecting the above fuse link with a bulb) The coil should be wired with the Positive terminal to the ignition Switch, and the Negative to the Distributor. (reversed from the way it came from the factory) The light switch has three connections one to headlights on one end of the wire wound resistor, one to tail lights on the L shaped connector on right. And a supply from a 20 amp fuse on the one with a wire hanging on it. To assure my theoretical statement on the light switch (I do not have on in hand) The knob in the off position (CCW from the Knob point of view) no connection to terminals. Knob in D position Full voltage to the L shaped metal. and 2.5 to 3 ohms across the input to the correct end of the resistor to put the light wires on. B position has full voltage to the L metal. and full voltage to the resistor terminal discovered earlier. No ohms between it and supply. There are diagrams in Bob M diagrams that should make this easy to do. Best of luck, Jim
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