General Soft wash Questions
Q: What is 12V soft washing?
A: Soft washing uses a low-pressure pump system to apply cleaning solutions safely. The pump is usually a 12V diaphragm pump, powered by a battery. Unlike pressure washing, it relies on chemistry, not force. That’s why wiring and install quality matter more than raw PSI — pumps burn out when power delivery is wrong.
Q: Why does wiring matter more than the pump?
A: Because every pump is only as good as the install. Undersized wire, long runs, bad crimps, or weak breakers cause voltage drop. A 12V pump that sees 10.5V at the motor will overheat, draw more amps, and fail early. Correct wiring = full voltage at the pump = longer life.
Pump Problems & Fixes
Q: Why do my pumps keep breaking?
A: 95% of pump failures come from install issues:
- Wrong wire gauge (voltage drop = overheating).
- Bad connections (extra resistance = more heat).
- Underrated breaker/fuse tripping under surge amps.
- No voltage drop test done before use.
- Wrong Tip
It’s not the pump — it’s the install or user.
Q: Can every demand pump be saved?
A: Most, yes. If the motor isn’t cooked, you can usually fix problems with proper wiring and testing. Replace cheap switches with a quality Dwell PS, and feed the pump with full battery voltage (13.8V from a charged system).
Q: What’s the difference between a Dwell PS and a Digital pressure switch?
A:
- Dwell PS: Mechanical, rugged, can handle higher amps. You can throw 30+ amps at it without issue.
- Digital PS: Sensitive, often capped at 150 PSI. When it resets, it can spike pressure and blow weak hoses.
Wiring & Power Issues
Q: How do I know if my wire size is correct?
A: Run the numbers. Use Ohm’s Law:
- Voltage drop = (Amps × Length × Resistance per ft).
- Remember: length is doubled (positive + ground).
- Rule: Keep drop under 3% (≈0.4V on 12V).
- I personal like to see 1-2% On 12/24 Volts Systems
Example: A pump pulling 20A at 30ft round-trip = 600A·ft. With 10 AWG (~1 mΩ/ft), drop = 0.6V. Too high. You need 8 AWG or thicker.
Q: Why is marine tinned wire better than copper?
A: Marine-grade wire is oxygen-free copper with a tin coating. It resists corrosion in damp, chemical-heavy environments. Bare copper oxidizes, raising resistance over time. Higher resistance = more heat = shorter pump life.
Q: How do I run a voltage drop test?
A:
- Set pump under load (spraying).
- Place voltmeter leads across battery – and pump + Take the Reading wait till it is charing up to PSI. That last number is what you want.
- Take Reading at pump. so the same thing, The strongest load is when it is charging up. Get that number
- If battery and the pump reading is more then a 3% lose.
- You MUST run bigger wire.
If drop >0.4V, upsize wire or fix connections.
Installation Best Practices
Q: Do I match wire gauge amp-for-amp with the pump?
A: No. Pump ratings show continuous amps, not surge amps. A 20A pump may surge 30–35A on startup. Always size wire and breaker for surge + distance. The GOAT rule: Build bigger than spec to keep resistance low.
Q: How far can I run my wires before I need to size up?
A: Distance is the silent killer. Even if a chart says 10 AWG handles 30A, that’s at short length. Double the run = double the drop. Past 20–25ft total, you usually need to step up at least one gauge.
Q: What’s the correct way to fuse and protect a pump system?
A: Place a breaker or fuse within 12” of the battery positive. Size it to handle pump surge without nuisance trips. Example: 20A pump → 30–40A breaker. Undersized protection = constant resets; oversized = safety risk.
Tools & Equipment
Q: What’s in the GOAT Approved Toolkit?
A:
- Marine tinned wire (6–12 AWG depending on run).
- Proper lugs & heat shrink.
- Quality breaker
- Dwell PS (not digital).
- Multimeter (reads to tenths of volts).
- Crimping + heat tools.
Q: What meter should I use for testing?
A: Any digital multimeter, but make sure it reads decimals (12.7V, not just 12V). Cheap meters round numbers, hiding drop problems.
Q: How do I read 13.8V on my volt meter?
A: 13.8V = system at charging voltage (alternator or charger running). Pumps love this range. If your meter reads 12.0–12.2V under load, you’re discharging the battery and stressing the pump.
Troubleshooting
Q: My pump shuts off randomly, what do I check first?
A:
- Measure voltage at pump under load.
- Check breaker/fuse rating.
- Inspect pressure switch (weak or digital models fail early).
- Verify hose pressure rating (hoses blowing = switch reset issue).
Q: Why do my hoses blow after using a digital pressure switch?
A: Because digital switches reset at max PSI (often 150+). When they kick back in, pressure spikes instantly. If your hose isn’t rated above that, it bursts.
Q: What’s the best way to trace power loss?
A: Step-test with voltmeter:
Battery → breaker → wire run → switch → pump.
At each point, check drop under load. Wherever the big drop happens = your problem (corroded lug, bad crimp, undersized wire).
Hope your learning some stuff!!!