Menu
What's new
By:
Advanced search...

Alternator issue?

dandreye

dandreye

Members
Messages
63
Reaction score
1
Location
London
Car
Accord 2L MT (CL7)
Hi All,

After jumpstarting my 2005 CL7 with a flat battery (the car has been left unattended for >3 months) the engine stalls right upon disconnecting the jumpstarter from the battery. I also tried leaving the jumpstarter connected and this way the engine stalls soon after on its own, apparently depleting the jumpstarter (it's a 16Ah/59Wh Gooloo ***an GP3000). After I give the latter some rest I can easily start the engine again with its help, so it seems the engine itself has no problems. Could it be anything else but dead alternator? It's first time I'm seeing this kind of issue.

I'm currently charging the battery to try it w/o the jumpstarter. Once the engine starts is it safe for all the electronics to disconnect the battery to see if it keeps running? Is it supposed to?

Many thanks in advance!
 
Last edited:
To test the alernator you need to measure the voltage in the system with the engine running. It should be putting out between 13.8 and 14.2 volts.
 
Richard B said:
To test the alernator you need to measure the voltage in the system with the engine running. It should be putting out between 13.8 and 14.2 volts.
Click to expand...
Yes, but the problem is: as soon as the jumpstarter is detached the engine stalls, so nothing to measure... I doubt I'll get the right reading if I measure it with the jumpstarter still attached to keep it running, or I will?
 
Last edited:
dandreye said:
Yes, but the problem is: as soon as the jumpstarter is detached the engine stalls, so nothing to measure... I doubt I'll get the right reading if I measure it with the jumpstarter still attached to keep it running, or I will?
Click to expand...
Measure the voltage before you start the engine, and with the engine running. You will get a good enough reading to see if the voltage of the alternator is too low, with the jumpstart battery attached.

(as long as the jumpstart "battery" is not a running car with a functioning alternator).
 
Richard B said:
Measure the voltage before you start the engine, and with the engine running. You will get a good enough reading to see if the voltage of the alternator is too low, with the jumpstart battery attached.

(as long as the jumpstart "battery" is not a running car with a functioning alternator).
Click to expand...
Will do: thank you. No it's a standalone jumpstarter here, not another car. In fact I no longer need it now that I have the battery fully charged.
 
Right, so with the fully charged battery the engine started and kept running fine w/o any jumpstarter and the charging voltage reading was stable at 14.5V, which I understand confirms that the alternator itself is fine (I measured it with the red probe at the alternator's positive contact and the "-" probe at the battery's "-". Unfortunately I forgot to measure it afterwards at both battery terminals to check the positive cabling in between). Could anyone please explain why it was previously stalling with the flat battery upon disconnecting the jumpstarter then? Shouldn't it keep running even with the battery detached once started?
 
Last edited:
You must log in or register to reply here.
Top