Motorhome won't start unless RV House Batteries are used
by Anonymous
I can't start the engine on my motorhome without using the RV batteries, engine has new battery, new alternator, new starter but won't start unless I use the RV batteries by flipping the dash switch, after the motor is running if I release the RV switch the motor stalls.
ANSWER: Hi thanks for submitting your question on our Ask An RV Question Page.
I am going to assume that you have checked the connections at the cranking battery and that they are tight and clean. You have double-checked to make sure that you have not mistakenly reversed the positive and negative connections at the cranking battery.
I am also going to assume that you have checked for any blown fuses or blown fusible link on the cranking battery.
If you have done all of the above and everything is good then I suggest that you do the following.
1. Make sure that the dash switch that you are using has not gone bad. Since the engine stops running when you release this switch it could mean the Auxiliary Battery start switch could be bad. This would be a simple fix to replace this switch.
There should also be a relay associated with this switch that may not be operating properly.
2. Even though you say that your Battery and Alternator are new; I would have them checked again as even new batteries and alternators can be bad from the factory.
Based on the information you have given me these are my best guesses on what is going on with your motorhome. Some of our visitors may be able to provide more suggestions on what you should check out to get this problem resolved.
Hope this helps.
Happy RVing
RVing Al
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