I am trying to track down and eliminate a recurring popping fuse and have already replaced the air check valves with SMC check valves.
Current Compressor wiring givens:
- The run from the battery to the 80 amp relay is approx. 7 feet.
- The run from the 80 amp relay to each Viair 400c is 2 feet.
- The run from each negative lead from each compressor to the frame is 2 feet.
Compressor wiring questions:
- I plan on running 4 gage wire from the positive battery to the 80 relay, is this adequate (probably overkill but I want to lower the resistance)?
- The pigtailed wiring from each compressor appears to be 12 gage or 10 gage, is this true for the Viair 400c compressor (I could not find the gage online)?
- The existing fuse was popping (60 amp barrel fuse) after filling 3 tires with multiple cycles of the compressors after filling the 2 gallon air tank, will be replacing with a Bussmann 60amp circuit breaker (285060). Is this circuit breaker a better choice compared to the barrel fuse?
- I have replaced the air check valves with quality SMC check valves. Is this a good check valve (I know the answer to this, but it is in the question section)?
- How does a 7 foot run of 4 gage wire that splits onto two 12 gage two foot long wires play into the total amperage? Does the step down negate the 4 gage wire advantage up to the relay?
- Is a 12 gage ground wire from each compressor to the frame sufficient, or should I run 4 gage wire back to the negative side of the battery? I would gang the two compressor black wires (2 feet long each) on the frame, and then run another ganged wire (4 gage this time, 7 feet long) to the battery.
- Can a weak 80 amp relay cause a 60 amp fuse to blow after about 10 minutes?
- Stock Viair relay sufficient or have these been a source of problems?
Just a recap of what I am planning to do:
- Add a Bussmann Hi-AMP 60A circuit breaker 1 foot or less from the battery positive terminal.
- Existing red wire from each compressor ganged on the output side of the relay.
- Existing black wire from each compressor gang attached directly to the frame (2 foot run).
Thanks for reading and I look forward to the answers from you wiring engineers/experts.