Experimental Wiring Diagram

You may also want to try visiting the Jumper Wire 101 page for more information on this topic. Both pages are similar. This one concentrates on Experimental aircraft starter wiring scenarios. Between the two pages, everything you never wanted to know about aircraft starter wiring is covered.

On experimental applications, Sky-Tec LS, PM & HT starters may be wired to utilize the starters' internal solenoid for use as the aircraft's starter contactor per diagram "A" below.

Nearly all known certified applications require the use of a firewall starter contactor and need to be wired according to diagram "B" below.

All Certified Sky-Tec NL starters must be wired per diagram "B" below. On standard certified NL (non /ec*) starters, there is no active "S" terminal. The small, "S" terminal on the standard NL model (non /ec*) starter is used to switch the starter from 24V (jumper wire removed) to 12V (jumper wire installed) operation and cannot be used to activate the starter in certified aircraft applications that utilize a separate starter contactor.

EXPERIMENTAL aircraft owners may rewire the NL starter if they desire to eliminate the aircraft's starter solenoid with the following caveats: 1) the push-to-start switch must be rated for 20A+, and 2) the wire between the two should be equally appropriate in gauge.

Diagram A

Experimental Aircraft Wiring Diagram

Applicable to:

- Experimental aircraft wishing to utilizing the starter's internal solenoid as starter contactor

- Sky-Tec LS, PM or HT starters

- Also: Sky-Tec HT starters on Robinson Helicopters (Certified)

Diagram B

Certified Aircraft Wiring Diagram

For use with all certified aircraft applications (except Robinson) and all NL starter installations (certified AND experimental)

Applicable to:

- Certified aircraft with firewall-mounted factory starter contactor

- Sky-Tec NL, LS, PM or HT starters

- Also: Sky-Tec NL starters on Experimental aircraft applications

	Diagram A Experimental Aircraft Wiring Diagrams	Diagram B Certified Aircraft Wiring Diagrams
For Lycoming PM/LS Starters	Click to Enlarge Diagram	Click to Enlarge Diagram
Van's Aircraft Diagrams for LS Starters	RV-6, -7, -8, -9 Diagram * NOTE: THIS IS A VAN'S AIRCRAFT WIRING DIAGRAM SCANNED DIRECTLY FROM VAN'S AIRCRAFT PLANS. WE CAN NOT EXPLAIN WHY YOU WOULD WIRE YOUR STARTER IN THIS MANNER. BUT IT WORKS FOR VANS.* Click to Enlarge Diagram NOTE: Van's diagrams do NOT apply to Sky-Tec NL starters! See NL Van's installation notes in NL section BELOW	With all due respect to Van's, Here's how we'd wire it if it were our RV and we were using the supplied ACS keyswitch to start: Click to Enlarge Diagram
For Lycoming HT Starters	Click to Enlarge Diagram	Click to Enlarge Diagram
For Continental C12ST2 Starters	NOTE: If installing the STC-certified KCST2 / C12ST2/S pull-start conversion, do not refer to these diagrams! Wiring instructions and diagrams for the STC certified installation can be found on the ST2 Comprehensive Certification Page Click to Enlarge Diagram	Click to Enlarge Diagram NOTE: Also applicable to STC Certified Pull-Start conversion.

For NL Model Starters (All require separate firewall solenoid)

	12V	24V
For Lycoming NL Starters	Click to Enlarge Diagram	Click to Enlarge Diagram
NL Starters in Experimental Aircraft (only)	Want to eliminate the starter solenoid and wire your NL starter according to the experimental wiring diagrams (A) for the PM/LS & HT starters above? Since the NL's S-Terminal has been repurposed for use as a 12v / 24v switch, technically you cannot do so. But if you're handy with the tools, have a start switch capable of a 20A peak load (no ACS key switches!), and just insist on doing things your own way, here is a diagram showing you how to rewire the NL solenoid to enable its internal solenoid for 12V installations ONLY.	N/A
For NL Starters on Van's Aircraft (RV-10)	USE THE DIAGRAM ABOVE FOR ALL 12V NL INSTALLATIONS DO NOT INSTALL NL MODEL STARTERS ACCORDING TO THIS DIAGRAM (BELOW) FROM THE VAN'S AIRCRAFT RV-10 PLANS: Click to Enlarge Diagram While this diagram is indeed appropriate for LS model starters (which Van's used on their factory RV-10), it does NOT account for the differing function of the jumper wire on NL starters in this diagram. Sky-Tec recommends the use of the 149-NL starter on all RV-10 applications, not the 149-12LS Van's used on the factory's RV-10. YOU CANNOT USE THE INTERNAL SOLENOID OF AN NL STARTER TO SERVE AS YOUR AIRCRAFT'S STARTER CONTACTOR! (at least not without rewiring the starter)	N/A

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