JUNRUO Ready-to-Use Alternator Pigtail with 96" Resistor Wire — LS Series 4-Pin, 105A Replacement, Long Lead

JUNRUO's ready-to-use 96" resistor wire pigtail converts a 12V feed into the correct alternator "on" signal for LS series 4-pin alternators.

This harness is a factory-ready replacement pigtail with a built-in resistor that lowers a full 12-volt source to the voltage an LS-series alternator expects for its 'field on' or remote-excitation signal. It is supplied with an extended 96-inch lead to give you routing flexibility in engine bays and is intended for GM LS engines using the 4-terminal flat alternator connector. The assembly removes the need for custom splices or separate resistors when using an engine control module (ECM) is not an option.

How does this pigtail make alternator wiring simpler?

The JUNRUO pigtail bundles the connector, resistor and long lead into one plug-and-play unit so you can replace a worn harness or adapt a 12V signal without extra components. Installation is straightforward: plug into the alternator's 4-pin flat connector and route the 96" lead to your switched 12V source or ignition feed.

• Integrated in-line resistor reduces raw 12V to the alternator’s expected signal voltage.
• Factory-terminated connector fits GM LS 4-terminal flat alternators.
• 96" lead length provides flexible routing and easier connections to the fuse box or ignition feed.

Will this work with my engine and alternator model?

This pigtail is designed for 1999 and newer GM LS-series engines that have the 4-pin flat alternator plug common to many Gen III alternators. Confirm your alternator uses the same flat 4-terminal connector and that it requires a reduced-voltage 'on' signal rather than a full 12V field feed.

• Compatible with Gen III LS alternators using a 4-pin flat connector.
• Appropriate for alternators lacking internal alternator control circuits.
• Not intended for alternators with integrated advanced electronic control modules unless specs match.

What are the practical benefits and installation notes?

The long lead eliminates the need for extensions and simplifies neat routing around engine components. Because the resistor is inside the pigtail, you avoid fabricating a separate resistor circuit or modifying the alternator; that keeps the installation cleaner and reversible.

• Ready-to-install; no soldering or separate resistor needed for compatible setups.
• Helps protect alternator control by delivering the proper 'on' signal voltage.
• Durable connector and insulation for typical under-hood environments; secure routing recommended away from extreme heat sources.

Who this is for: mechanics, hot-rodders, engine-swappers and DIY car owners who need a reliable alternator signal pigtail for GM LS Gen III engines. If you are replacing a damaged plug, retrofitting a non-ECM setup, or wiring an alternator that requires a stepped-down "on" signal, this JUNRUO 96" resistor wire pigtail removes guesswork and avoids custom resistor installations. Confirm connector type and alternator control requirements before purchase for best results.