Don St Peter Posted December 2, 2014 Report Share Posted December 2, 2014 I have attached a file ( hopefully) showing tester hookup for checking ignition system for neg ground system. Can someone take a look at it and tell me how to hookup a pos ground system like my 40 Ply. Thanks In AdvanceScan0001.pdf Quote Link to comment Share on other sites More sharing options...
desoto1939 Posted December 2, 2014 Report Share Posted December 2, 2014 I would think just in the opposite connections. So If you have positive ground thenthe positive clip goes to the ground and the negative goes to the poser source. So when you have a battery charge the positive clip which is the red clip then would go to the ground and the black clip then goes to the power or to the connection that is feeding the battery when charging the battery. Have a negative ground sears timing light. I just switch the clips to be in there respect domain based on the grounding of the car. So red to ground. this red has the positive mark on the clip and this goes to the grounding metal part like the headbolt and the negative which has the minus sign then goes to the power to feed the battery. It works. Rich Hartung desoto1939@aol.com Quote Link to comment Share on other sites More sharing options...
Merle Coggins Posted December 2, 2014 Report Share Posted December 2, 2014 Pos (red) to Pos (+) and Neg (blk) to Neg (-). In your case the Pos (red / +) happens to be the ground rather than the "Hot" side. Merle 1 Quote Link to comment Share on other sites More sharing options...
DonaldSmith Posted December 3, 2014 Report Share Posted December 3, 2014 Look at the battery posts. Connect Red (+) to Red (+) and Black (-) to Black (-). Quote Link to comment Share on other sites More sharing options...
Don St Peter Posted December 3, 2014 Author Report Share Posted December 3, 2014 Thanks Rich and Merle. Got that part, but I still seem to have a mental block translating what you say to the ignition system voltage drop test as shown on the schematic I attached. For example, if I hook the red lead of tester to the pos. post of batt (gnd.)., then do I hook the blk lead of tester to the coil neg. and jumper the pos. of coil to ground or do I hook the blk. lead of tester to coil pos. and jumper the Neg. of coil to ground? Sorry for adding to confusion. Don Quote Link to comment Share on other sites More sharing options...
Merle Coggins Posted December 3, 2014 Report Share Posted December 3, 2014 (edited) To translate the pictures in your document, your coil should be connected in reverse of what's drawn. The (-) should be connected to your ignition switch and the (+) should be connected to the distributor terminal. And where they show connecting to the (+) on the battery, you would connect to the (-). So, on your diagrams switch the (+) and (-) symbols and then connect your red to (+) and your black to (-). Although I also see that they are connecting the Black to the (+) connection of the coil, so that could create some confusion. So maybe you could just think "Black is Power" and "Red is Ground" for your tester. Edited December 3, 2014 by Merle Coggins Quote Link to comment Share on other sites More sharing options...
Don St Peter Posted December 3, 2014 Author Report Share Posted December 3, 2014 Merle Thanks for the translation on the picture. I guess I am just confused when I see the black lead of tester hooked to + connection of the coil. Tx again Don Quote Link to comment Share on other sites More sharing options...
Merle Coggins Posted December 4, 2014 Report Share Posted December 4, 2014 That type of connection is a way to measure the voltage drop within a particular part of a circuit. It's not a test I use often but it can give a good idea of the condition of switches, connections, and wires. Quote Link to comment Share on other sites More sharing options...
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