Positive and negative hookup for Schumacher 2/40 charger

This appears to be a battery charger. We have a category for that.

The search query would be 'make model wiring diagram'.

'make model (what it is)' in all questions please.

https://www.google.com/search?q=schumacher+selector+switch+off%2Fon+wiring+diagram

..

I assume you mean to charge the main car battery? if so, with power turned off for your battery charger, you need to connect the Positive (+Red) to the Positive of the charger, and the negative (-ve Black) to the negative of the charger, check connections are correct and then power on your battery charger. Lots of youtube videos on this if you need help.

Bottom line is yes, but how the charger connects must be compatible.
If it's a wired charger, connect the charger power wires with proper polarity. Positive to positive, negative to negative.
If the charger is a cigar lighter type, then make, build, or squire a reversed polarity jumper. A male cigar lighter jack with wires output and a female cigar jack on the end of the wires where polarity is crossed.
Please be more specific for a better short answer.

2006 Dodge Dakota Car Stereo Wiring Guide
Car Radio Battery Constant 12v+ Wire: Blue/Red
Car Radio Accessory Switched 12v+ Wire: The radio harness does not provide a switched power source. Run a wire to the fusebox for switched power.
Car Radio Ground Wire: Black
Left Front Speaker Positive Wire (+): Dark Green
Left Front Speaker Negative Wire (-): Dark Green/Brown
Right Front Speaker Positive Wire (+): Gray
Right Front Speaker Negative Wire (-): Gray/Brown
Left Rear Speaker Positive Wire (+): Dark Green/Dark Blue
Left Rear Speaker Negative Wire (-): Dark Green/Orange
Right Rear Speaker Positive Wire (+): Gray/Dark Blue
Right Rear Speaker Negative Wire (-): Gray/Orange

talking car battery and charger
connect the charger positive to positive of the battery and charger negative to negative if the battery
connect the leads first then turn the charger on

1. I assume this is a car battery so the first thing you do is to disconnect the vehicle cables from the battery terminals. The negative first and then the positive. The positive terminal is marked with a plus sign ...+ ... When refitting the cables to the
battery after it is charged you fit the positive cable to the positive battery terminal(+) first and fit the negative(-) last.

2. Now that the battery is unconnected from the vehicle you can fit the charging cables to the battery terminals. The charger you have should have 2 cables leading from it , a positive with a red plastic insulation on the clip and a negative cable probably with black insulation on the clip.The instructions with the charger will tell you in which order the cables are to be attached to the battery and the order you remove them. Each of the 2 cables has to be clipped onto the correct battery terminal. The positive cable(+) from the charger goes to the positive battery terminal (+)and the negative cable(-) from the charger goes to the negative battery terminal(-).

3. Once the cables from the charger are properly connected to the battery, you can plug in the charger and turn on the power.

4. Batteries generate explosive gasses when being charged and it only takes one small spark to ignite them. Don't reconnect the battery after charging for a half hour or so and make sure the area where you are charging is well ventilated.

Yes, you can. Be advised to hook the positive cable to the positive posts first ( + ) on both batteries, then the negative cable to the "good" battery negative post ( - ) next, then to the "bad" battery's negative post.
It is preferable to do the last step hookup to the engine block (or somewhere else that is steel) than the bad battery to prevent a spark which very rarely can make an explosion.
Also remember. Your alternator is not a battery charger. Therefore, if and when you decide to "boost" someone else off, after you hook up the cables you may well need to have your car engine running about 1,500 RPM and leave the cables to the "bad" battery on for about 5 minutes.

hi.
basically, with any charger, the positive (red +ve) wire goes to the positive post.
the negative (black -ve) goes to the negative post.

there is a power center (referred to as the 'power distribution center) under the hood, it has a plastic cover-there is one large cable at the top. bolted to a stud-that is your main power feed from the battery to the power distribution box. Connect the positive charger cable there.

Okay... One can not see the negative battery terminal so.... Connect the negative clip from your charger to the chassis and then remove the RED plastic cover in front of the black relay box above the battery OR the plastic cover from the positive battery terminal and connect the positive cable. Make sure you have good connections by watching the meter on your charger. Then plug in the charger and turn it on. Charge time depends on the strength of your charger. I'm going to go hook mine up again because I need to go out for a bit. I don't think I'm going to like changing this battery..... Just thought I'd share..... Good luck.