Alternator

Alternator Upgrade Sizing cable to battery

Alternator Upgrade Sizing cable to battery
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  • Vovich Mechanicovich
  1. What gauge wire goes from alternator to battery?
  2. Can I wire my alternator directly to my battery?
  3. Do I need a bigger alternator for a bigger battery?
  4. What size of battery cable do I need?
  5. How do I increase the amperage of my alternator?
  6. What is the amperage of my alternator?
  7. Will dual batteries hurt my alternator?
  8. Does the positive wire go to the alternator?
  9. What does R and F mean on an alternator?
  10. How do I know if I need a bigger alternator?
  11. Do I need a bigger alternator for two batteries?
  12. Will a capacitor help my alternator?

What gauge wire goes from alternator to battery?

Battery Wire Size per Voltage, Amperage Load and Length

System VoltageAmps< 5 Ft
12 Volt0-608 AWG wire
12 Volt60-1006 AWG
12 Volt100-1504 AWG
12 Volt150-1904 AWG

Can I wire my alternator directly to my battery?

Attach a cable directly from the alternator output post to the positive side of the battery. This allows for full output from the alternator to the battery when heavy electrical demands are placed on the alternator. Wire the alternator controls.

Do I need a bigger alternator for a bigger battery?

Battery Wire Size and High Output Alternators

When upgrading to a higher output alternator you should always install a larger wire between the alternator and battery . Even with a standard output alternator you will get better performance and life out of your alternator if you upgrade the main battery wiring.

What size of battery cable do I need?

Battery Cable Amperage Capacity Chart

Recommended Length and Amperage for Battery Cable while maintaining a 2% or less voltage drop at 12 volts
Battery Cable Size50 Amps150 Amps
4 Gauge (AWG)18.8 ft6.3 ft
2 Gauge (AWG)29.8 ft9.9 ft
1 Gauge (AWG)37.7 ft12.6 ft

How do I increase the amperage of my alternator?

You can achieve a higher peak amperage by putting fewer turns of heavier wire on the alternator stator windings. That reduces the winding impedance and lets more current flow, provided you have enough changing magnetic flux to excite the windings.

What is the amperage of my alternator?

The size of an alternator will most likely increase the set amperage, too. High output alternators (often found on larger vehicles) can use between 200 to 350 amps. Smaller cars by comparison, such as a Ford Mustang, will only use about 100 amps with batteries that run at about 12 volts.

Will dual batteries hurt my alternator?

You should not incur any issues using a secondary battery with a battery isolator. It will not cause any damage to your alternator. For your edification, it won't be using wasted energy, but your engine will probably using a tad more gas to operate the alternator, which will have to do more work.

Does the positive wire go to the alternator?

If your vehicle has an ignition wire, do not connect it to the alternator. Insulate and secure to prevent shorting. All that is needed is the main positive, negative cables and jumper wire connected to the alternator (S) and B+ terminals in order for it to operate.

What does R and F mean on an alternator?

The R and F terminals are the 'Reference' or voltage sense terminal and the 'Field' terminal. The color on the spade connectors doesn't matter, you will have to use a multimeter to determine which connector goes to which pin. The R will be hot at all times while the F will only be hot when the ignition is keyed on.

How do I know if I need a bigger alternator?

There are a few ways to figure out whether you need to upgrade your alternator. A few telltale signs are dim headlights, poor stereo system performance, or an alternator that simply wears out quickly. You can also check your electrical load using an ammeter.

Do I need a bigger alternator for two batteries?

A car alternator will be more than capable of charging two batteries. ... The first is if both batteries are low on charge then that would be too much for the alternator, but if only one is low then it would be fine. The second thing is linking the batteries will cause more problems.

Will a capacitor help my alternator?

Capacitors will not make up for an inadequate power source. They WILL filter the power, providing a cleaner power flow to the amps, as well as filtering the draw from the battery & alternator.

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