Automatic circuit breaker goes off abruptly again after switching it back on

Possible cause: Points to a wiring short or a fault to earth somewhere in the system.. This needs a qualified electrician to check it over and fix it - repeatedly flipping the breaker back on won't resolve anything.

Alternator isn't topping up the habitation battery while driving

Work through this checklist: check the 50A fuse feeding the ancillary battery near the starter battery, check the 40A fuse feeding the combined unit, confirm the 'motor running' signal is present at the input module, and confirm the SMP 439-10 combined charger/booster is actually active.

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Hobby • Electrical System

Covers: Ontour Van, Ontour Van Tumbo Edition, Prestige Van

+1 more

Prestige Van First Edition

Ontour Van models: 600 FT, 640 ET

Ontour Van Tumbo Edition models: 600 FT, 640 ET

Prestige Van models: 640 ET

Prestige Van First Edition models: 640 ET

Hobby Electrical System

(Vans, 2026 Model Year)

View official manual on manufacturer's site ↗

Master Troubleshooting & Diagnostics Matrix

Error Code / Indicator	Symptom / Meaning	Possible Cause	Step-by-Step DIY Fix	Suggested Actions
`N/A`	Automatic circuit breaker goes off abruptly again after switching it back on	Points to a wiring short or a fault to earth somewhere in the system.	This needs a qualified electrician to check it over and fix it - repeatedly flipping the breaker back on won't resolve anything.	DIY Check / Tech Fallback
`N/A`	Alternator isn't topping up the habitation battery while driving	—	Work through this checklist: check the 50A fuse feeding the ancillary battery near the starter battery, check the 40A fuse feeding the combined unit, confirm the 'motor running' signal is present at the input module, and confirm the SMP 439-10 combined charger/booster is actually active.	DIY Safe