What gauge wire do you need from alternator to batt one hook up?

The gauge of wire you need from the alternator to the battery will depend on the maximum current that the alternator can produce. A good rule of thumb is to use a wire gauge that is one size larger than what is recommended by the alternator manufacturer. For example, if the alternator manufacturer recommends using a 10 AWG wire, you should use an 8 AWG wire. This will help to ensure that the wire can handle the maximum current without overheating or causing any other problems.

In addition to the current-carrying capacity of the wire, you will also need to consider the length of the run from the alternator to the battery. The longer the run, the thicker the wire will need to be. This is because the resistance of a wire increases with its length, so a longer wire will need to be thicker in order to maintain a low resistance.

As a general rule of thumb, you can use the following table to determine the appropriate wire gauge for your alternator:

| Maximum Alternator Current (Amps) | Recommended Wire Gauge |

|---|---|

| Up to 60 | 10 AWG |

| 61 to 100 | 8 AWG |

| 101 to 150 | 6 AWG |

| 151 to 200 | 4 AWG |

| 201 to 250 | 2 AWG |

| 251 to 300 | 1 AWG |

If you are unsure of the maximum current that your alternator can produce, you can consult the alternator manufacturer's specifications.