Most starters are marked with a + (positive) and a - (negative) on the terminals themselves,just like your battery. Usually the larger terminal where the battery cable connects to the starter is the positive terminal. .
On a most starters both posts are hot(+) and the casing is grounded(-) .Usually the bigger post is a direct wire from the battery and the smaller post is a remote wire from the starter switch.
Follow the positive battery cable wire (+) to the other end, that should lead you there. Because it will be connected to the starter solenoid. Please take note, a solenoid mounted on a starter has no ground wire, but a solenoid separated from the starter and mounted on the firewall does.
Look for a + by the positive terminal and a - by the negative terminal, or red for positive, black for negative. Some batteries have the positive terminal protruding and the negative terminal flat. Or you can get a meter that will tell you which is which,
Use a jumper wire from the battery + (pos) terminal to the positive on the blower motor, and run a - (Ground) wire from ground on the motor, to chassis or frame.
You start by disconecting the negative - battery terminal. climb undre the car and dixconect the 2 whires going to the starter. Then unbolt the starter from the transmission. replace is the same way, just oppisite. If you don't even know where the starter is than, follow the positive battery cable till it stops. that is the starter.
Some never used positive ground and always had negative ground. The last year that I know where positive ground was used was in 1969 when Jaguar switched to negative.
Following the cables into the engine compartment. The positive cable will run to the alternator or the starter. The negative cable will just connect to a ground source (engine block, frame, etc.)
I own a 1948 John Deere B so I know for a fact that B's serial number 201000 and up have positive ground. Don't reverse the polarity cause it'll fry the generator and possibly the starter (the starter might even turn backwards - not sure cause I've always been sure to connect the batter with positive ground). The older B's should most likely be the same as 201000 and up. My dad told me that a lot of old vehicles from the 40's had positive ground. Not sure why though.
Hook up the positive battery terminal first then the ground. Make sure you know wich cable is wich. The ground ( usually black on American cars, brown on European ) will lead from the battery negative pole to the body of the car or be grounded on the engine probably near the alternator. The positive cable ( usually red on American cars, black on European cars) will lead to the starter solenoid. If you aren't sure consult your repair or owner's manual but don't get them backwards whatever you do.
Normally the terminals are marked on the coil ( if it's a bosch coil the one marked 15 is the primary winding positive terminal ). The large center one is the secondary positive ( the one that leads to your distributor ) and the two on the sides of it are the positive primary and the ground. If you don't know wich one is wich disconect the battery then disconnect the two smaller wires and remember wich one goes where. Use an ohm meter to test the resistance between a good ground on the body or engine block on each wire. The one that has no or very low resistance is the ground wire. If you are holding a coil in your hand and it isn't marked use the ohm meter to check the resistance between the secondary positive and the other two terminals. There should be infinite resistance ( open circuit ) to the positive of the secondary and 6Kohms or there abouts to the common ground terminal.
grounding is always neg on a 12 volt american car. I only know bulldozers that reverse it. hope that helps you out.
Turn car on remove positive battery terminal if car turns off alternator is bad
The best way to check a starter is to take it out of the vehicle and bench test it. Disconnect your battery ground before you do and remember ( or better yet mark ) the wires to know where to properly reconnect them. After the starter is out of the car you will need a set of jumper cables, a fused jumper and a fully charged battery. Connect the negative cable to the negative battery terminal and the body of the starter. Usually it is easiest to hook it up to the mounting flange where the bolt holes that hold it onto the motor are. The positive lead should be connected to the larger of the studs where the thickest cable was connected to the starter solenoid. Then, using your fused jumper, jump the positive lead to the smaller of the studs on the solenoid where the ignition signal came from. If you aren't sure wich wire gave the ignition signal consult your repair manual, electrical schematics or don't attempt this test. When you jump the power to this terminal the solenoid should click and the starter motor should whine. The bendix spring will kick out the starter gear and it will start to spin. If these things don't happen your starter or the starter solenoid is faulty. Keep in mind that a blown fuse or fusible link, faulty relay, dirty ground connection or wire connection, faulty ignition switch, or a shorted wire can also cause a starter not to operate correctly.
easiest wat to check a starter is to turn on ignition.then with a screw driver cross the positive lead to starter wire on the starter motor if the starter is good this will turn over the engine if starter is bad it will not if this does tuen over engine , you can then check solenoid and other ignition parts