How Much Amperage Should 4 Trailer Brake Magnets be Drawing
Question:
How much voltage should be at the brake wire close to the magnet with the brake controller maxed out this trailer has two axles with four brakes and they pull about 15 amps
asked by: Stacy P
Expert Reply:
For a trailer with 4 brake assemblies (10 or 12 inch assemblies) you should be seeing 15 to 16.3 amps at 12 to 13 volts. If the trailer has 7 inch assemblies it would be lower, 12.6 to 13.7 amps at 12 to 13 volts.
Individual magnets on 10 or 12 inch assemblies should show 3.2 to 4 amps and on 7 inch assemblies you should see 3 to 3.2 amps.
If your trailer brakes seem weak then you may just need to adjust the brakes. To see how to manually adjust trailer brake assemblies check out the video I attached, fast-forward to the 4:35 mark of the video. If you need an adjustment tool use # W80630.
Products Referenced in This Question
Brake Adjustment Spoon for Drum Brakes
- Accessories and Parts
- Trailer Brakes
- Hydraulic Drum Brakes
- Adjuster
- Brake Adjuster Tool
- Performance Tool
more information >
Product Page this Question was Asked From
Tekonsha Prodigy P3 Trailer Brake Controller - 1 to 4 Axles - Proportional
- Trailer Brake Controller
- Proportional Controller
- Electric
- Electric over Hydraulic
- Automatic Leveling
- Under-Dash Box
- Dash Mount
- Up to 4 Axles
- LCD Display
- Up to 360 Degrees
- Tekonsha
more information >
Featured Help Information
Instructions
Miscellaneous Media
Continue Researching
- Shop: Replacement Magnet Kit for 12" Electric Trailer Brake Assemblies - 5,200 lbs to 7,000 lbs
- Q&A: Is There Differnce Between Trailer Grease Seals 10-36 and GS-2250DL
- Shop: Replacement Front Jack for Lippert Ground Control 3.0 Leveling System
- Q&A: Troubleshooting Trailer Brakes on One Side that Apply Harder than the Other
- Shop: Replacement Brake Adjuster Screw - 10" and 12" Dexter Nev-R-Adjust Electric Trailer Brakes
- Shop: Grease Seal - Double Lip - 2.250" ID - 3.376" OD - GS-2250DL
- Shop: Grease Seals 10-36 (pair)
- Shop: Replacement Brake Wire Grommet for Dexter Electric Brake Assemblies - Qty 1
- Search Results: brake hub
- Shop: Easy Grease Trailer Hub and Drum Assembly for 3.5K Axles - 10" - 6 on 5-1/2 - Pre-Greased
- Shop: Brake Controller
- Search Results: trailer brake away switch
- Search Results: electric trailer brakes
- Article: Testing Trailer Brake Magnets for Proper Function
- Video: Review of Redline Trailer Leaf Spring Suspension - Hangers - Suspension Kits - HAP-105-205-01
- Article: Brake Controller Installation: Starting from Scratch
- Article: How to Install a Brake Controller on Chevrolet / GMC 1999-2006 Pickups
- Q&A: What Voltage and Amperage Should Trailer Brake Magnets Have
- Q&A: Voltage at Brake Magnets is 8 Volts with Brake Controller Set to Maximum
- Q&A: Troubleshooting Trailer Brakes Getting Only 8 Volts Of Power
- Q&A: Amperage of Brake Magnets and Size of Wire Used To Connect 7-Way Trailer Plug To Electric Brakes
- Q&A: Trailer Brakes are Weak and Low Voltage and Amperage at Brake Magnets on 5th Wheel Trailer
- Article: Wiring Trailer Lights with a 7-Way Plug (It's Easier Than You Think)
- Shop: Trailer Wiring
- Video: etrailer Trailer Brakes AKBRKR-S-12 Review
- Search Results: circuit breaker
- Article: Troubleshooting Brake Controller Installations
- Article: How to Adjust Your Trailer Brakes | The Ultimate Guide
- Shop: Suspension Enhancement
- Video: Best 2018 Ford Transit T250 Trailer Wiring Options C56327