The 9038A Relay Bypass Switch Kit with Amp Loop gives technicians the ability to test and control 12V circuits independent of key-on systems. Perfect for diagnosing components like fuel pumps, cooling fans, and electric motors, this kit makes pressure testing, current measurement, and circuit isolation easier and more accurate.

Each relay features an integrated amp loop, allowing safe and easy current monitoring with clamp-on amp probes or lab scopes. This helps detect overcurrent conditions and identify worn or failing motors based on amp draw behavior.

The kit includes six relay styles covering a broad range of domestic and import vehicles. Note: the large relays are rated for 20A continuous / 30A surge, while the smaller spade relays are rated for 10A continuous/20A surge.

Features and Benefits:

• Actuate fuel pumps with the engine off for pressure testing
• Bypass relays to control circuits independent of key-on systems
• Plug-in relay replacements – no modifications needed
• Choose the right kit for your application: spade, rectangular, master, or amp-loop
• Amp-loop version (#9038A) allows current monitoring with standard probes

Includes:
• Small Spade Relay – Domestic, Korean, and Japanese 2000 and newer (#9036A-1) (10A/20A) • Medium Spade Relay – Domestic and Japanese 1970–2009 (#9036A-2) (10A/20A) • Large Spade Relay – Volkswagen 1999–2005, Audi 2004–2006 (#9036A-3) (20A/30A) • Large Rectangular Relay – GM, Chrysler, Japanese 1995–2007 (#9037A-3) (20A/30A) • Square Relay – BMW 1995–2006 (#9037A-2) (20A/30A) • Small Rectangular Relay – GM, Chrysler, Japanese 1985–2009 (#9037A-1) (20A/30A)