Should a fuel injected Honda 90 be able to stay running with a bad/dead battery

[Jmac870]

First off this is my first fuel injected motor and its a 2012 Honda BF90 EFI. The other day I launched my boat to fish stripers and made the 6 or 7 km trip out to the fishing grounds no problem. After anchoring and fishing for a couple hours we went to leave and the battery wouldnt even turn the motor over. Another boat came to help and we boosted the boat and they took off assuming I was all good. I didnt make it halfway back to the ramp and the motor bogged down and died. In the end I had to have a battery brought out by another boat. Question being should the alternator on the motor produce enough power to keep the motor running ? I am aware I could have a bad alternator and plan test that tonight once the battery comes off the charger. Just want to know if the alternator is working should it keep the motor running even if the battery is toast ?

 

[Sea Rider]

For peace of mind check the alternator condition and install a new battery rated for that motor...

Happy Boating​

 

[ahicks]

First off this is my first fuel injected motor and its a 2012 Honda BF90 EFI. The other day I launched my boat to fish stripers and made the 6 or 7 km trip out to the fishing grounds no problem. After anchoring and fishing for a couple hours we went to leave and the battery wouldnt even turn the motor over. Another boat came to help and we boosted the boat and they took off assuming I was all good. I didnt make it halfway back to the ramp and the motor bogged down and died. In the end I had to have a battery brought out by another boat. Question being should the alternator on the motor produce enough power to keep the motor running ? I am aware I could have a bad alternator and plan test that tonight once the battery comes off the charger. Just want to know if the alternator is working should it keep the motor running even if the battery is toast ?

I would think it should? The issue may have been that battery sucking so much of the available charge power that it managed to lower what was available to the ECU where it shut down.

I would find out if your battery is any good first. Run some tests on that. Once you get a fully charged known GOOD battery in place, THEN you can check out the charging system to see what's going on there. There may be repairs required there as well? Too many variables here to predict much....

 

[Sea Rider]

It's so simple to check the alternator and the rectifier output with a proper tester, test which is bad and replace, if both good change the battery...

Happy Boating ​