Recommended Wire Gauge to Use with Battery Isolation Solenoid
Products Featured in This Question
Question:
Hello, I recently purchased a battery isolator to install an auxiliary battery on my car hauler to power interior lights and a 1500w power invertor. What gauge wire should I run from the isolator to the positive terminal of the battery? Standard 4ga wire? Does that wire need to be fused? Im doubt this would matter, but I plan on wiring the 12v stud on the isolator to the parking lights on the trailer side
asked by: Jon S
Expert Reply:
When using a battery isolator solenoid like the # PK5231201 that you referenced we typically recommend using 10 gauge wire like # 10-1-1 or # 10-2-1 (sold by the foot). No fuse will be needed for the solenoid center pin as its function is really only to close the circuit to let voltage pass through the other two pins.

Product Page this Question was Asked From
Starter Solenoid - SPST - 12 Volt - 100 Amp - Continuous Duty - Grounded
- Accessories and Parts
- Battery Boxes
- Switches and Solenoids
- 100 Amp
- Pollak
more information >
Continue Researching
- Q&A: How to Wire 12V Battery in Enclosed Trailer to Power Trailer Lights Independent of 7-Way Connection
- Article: Trailer Wiring Diagrams
- Q&A: Will Dexter Self-Contained Hydraulic Jack Fit Dump Trailer
- Article: Brake Controller 7- and 4-Way Installation Kit (ETBC7)
- Q&A: Can Self-Contained Hydraulic Jack e33VV be Welded on
- Q&A: What Are Dimensions of Housing on Self-Contained Hydraulic Jack e33VV
- Q&A: Can I Charge My Trailer Battery Using 7-Way Trailer Connector on Truck
- Q&A: How to Charge a Trailer Battery Through a 7-Way Connector
- Q&A: Installing DC Power And Power Inverter To Cargo Trailer
- Article: How to Charge a Trailer Battery While Driving: 3 Common Problems (And How to Fix Them)
- Article: Wiring Trailer Lights with a 7-Way Plug (It's Easier Than You Think)
- Article: How to Wire an Electric Winch
- Article: How to Dump Black and Gray RV Waste Tanks
- Article: How to Measure for Trailer Hitch Drop