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JsAlternators High Output Alternators FAQ

Frequently Asked Questions
Welcome, we hope to provide quick, DIY solutions to any problem you may be experiencing. This section also seeks to provide quick answers for any inquiries you might have. We of course have full confidence in our products; we would however like to ensure that our clients have the right guidance on installation as this will save them from any difficulty.

Ensure you disconnect your battery first before attempting to work on the electrical system of your vehicle.

How long will it take before my order ships:
Orders ship within 5 to 10 business days sometimes sooner. If for some reason parts are on back order, we will notify you, but this is not common.

Slipping belt – Each of our high output alternators come with smaller overdrive pulley. This pulley is made to increase low RPM charging for maximum output. It is custom for the diameter of the overdrive to be less than your factor pulley, depending on the kind of vehicle you own. If the belt provided does not suffice, you may get the right length from your local parts store. In using the belt and the pulley system, ensure that each part of the pulley system is free of oil or grease, this will help its efficiency.

Regulator plug – currently not plugged in or not seated well, it would be important to make sure that the small regulator plug that is located on the back of the alternator is well plugged in for the correct functionality. Do not forget to plug them in completely, try not to jam the plugs in backwards, avoid pinching them in all the way in order not to create a short. Ensure that your new alternator’s plug matches the one from your old alternator, this is very important.

Alternator pulley changed by customer – Our high output alternators come with an overdrive pulley. The pulley is designed to improve low RPM charging so that it yields maximally. Do not change this overdrive pulley out with a larger diameter pulley. When alternator pulley diameter is increased, the output amperage decreases.

The alternator I got is not working.
Our products are custom built to perfection, bench tested, and confirmed to excel in performance specs before they are shipped out to our clients. The top reasons we have observed that could likely be a reason why our products wouldn’t function include the possibility of it being damaged during shipping or installation, or it could possibly be the wrong one for your application altogether. If you certain you have gotten the right alternator for your application and it was not damaged during shipping, you are implored to refer to our manual for correct installation guide, it happens that if the alternator was not well installed, it will not work.

The alternator I got does not “put out.”
As promised to all our customers, our products are fully tested ensuring their outstanding performance before shipping. In our experience through the years, it is in many cases not the alternator itself. You must ensure you consider a few possible concerns in your troubleshooting – please read the instruction manual thoroughly.

Warranty and Shipping
All orders are custom built. Orders ship within 5 to 10 business days unless parts are on back order but customers are notified if that’s the case. We offer lifetime warranty on alternator labor and one year warranty on parts. If your package is damaged during shipping, we are not liable for the cost of repair nor the return shipping fees. However, we are happy to fix the damage made by shipping, Free Labor. All orders are heavily wrapped for shipping with several layers of big bubble wrap and two layers of boxes along with the Fragile sticker on the box. If you have to ship your alternator back, please be sure you wrap it the same way to prevent further damage.

Battery Light Comes On – Alternator Not Charging
The reason could be one of two things:
Either the plug is wired incorrectly or the computer is sensing the higher voltage and causing the battery light to come on even though the alternator is charging properly. Please refer to the instruction manual tab on the website for specific instructions that will help you with wiring. For some older vehicles, the factory style regulator is not available with the hairpin style alternator. This is why your high output alternator will come already “upgraded” with the 15 volt regulator. It will have an oval plug which requires splicing into the factory plug. This is a simple ,fast step and these instructions are detailed for you in the instruction manual.

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Alternator Installation

Installation Manual
Safety tips:
-Wear eye protection
-Remove jewelry or any loose items
-Allow car to fully cool before starting installation

Steps to installing alternator:
*Batteries must be fully charged before installation.
1. Make sure vehicle is off and engine is cool.
2. Disconnect the negative cable from the battery/batteries.
3. Disconnect all other wiring from the alternator.
4. Remove the belt (note the belt routing before removing).
5. Remove the bracket bolts and original alternator.
6. Mount the new alternator. In general, the original bolts will be used.
7. Inspect he belt and replace if there are any signs of wear. We suggest you replace the belt with a .5 to 1-inch shorter belt when installing a high output alternator. Install the belt.
Make sure routing is correct and the belt is aligned to all pulley grooves.

Connections of frame/body: Clean all metal surface of any paint or rust with a wire brush or die grinder. Use a conductive corrosion inhibitor available at any electrical parts supply store.

Grounding (Uni-body frame warning): Many newer vehicles have “uni-body” or sheet metal frame structures with no traditional “full frame”. Because of seams and adhesive attached body components, additional steps may be required for proper chassis grounding. Choose the location on the sub-frame with the thickest metal possible. If there is lower than spec charging voltage at the battery, move ground connections or add additional ground cables to different frame components.

*Keep all electrical wiring at least 12” away from heat sources or the jacket of the cable could catch fire.

Alternators with one wire
Self-exciting or better known as “one wire” alternators will have NO plug on the alternator, and the OEM alternator harness plug will be left disconnected. This type of alternator requires only the positive and negative battery cables to be connected to the alternator to function. These alternators are internally regulated and will turn themselves on and off with engines rotation and regulate their own charging voltage. (May cause battery light to cut on).

Turn on – single wire alternators
If your alternator comes with a pigtail that plugs into the alternator, connect the excite wire (L) to 7v to 15v ignition power source and connect sense wire (S) directly to positive post on alternator.

It is highly recommended you add a dash mounted volt gauge.
Connect the battery ground and confirm all other electrical connections are complete. Confirm the belt path is correct and clear of obstacles.

Before starting the vehicle, check and confirm that the battery is charged. Starting the vehicle with a discharged battery can damage the alternator.
Use a battery charger to charge the battery first if voltages are not adequate.

Ground path resistance test
If greater than 0.1V is measured improve:
Confirm all paint, anodizing, rust removed, and the connections are to bare metal.
Make certain all terminals are tight to the wire.
Make certain the ground wire is of proper size.

Charge path resistance test
If greater than 0.1V is measured improve:
Alternator charge post nut is tight.
Make sure charge wire is proper size.

Battery recommendation
2000w – upgrade main battery, 1 rear battery.
3500w – upgrade main battery, 1-2 rear batteries.
5000w – upgrade main battery, 2-3 rear batteries.
7500w – upgrade main battery, 3-4 rear batteries – 2 alternators.
10000w – upgrade main battery, 3-5 rear batteries – 2 alternators.