what is best way to check charging system on drz 400 sm ??

best way to check charging system on drz 400 sm , need to check it out but where to start

Edited by anthonyzx10r

use the search, it's already documented :smirk::bonk:

it reads 12volts sitting , and 14volts running . here is the problem the bike starts right off the battery tender i can let it run a few mins . start it 2 or 3 more times , then out of no where the battery is to weak to turn the motor over , that 10 amp battery should turn it over for a lot longer then a few times .

If the battery reads 12V after the battery tender indicates it is charged either the tender isn't working right or the battery has a bad cell. Same if you run the bike riding around for 10 minutes or so. If the battery reads below about 13V after charging it is suspect.

If a battery has been allowed to run dead a few times it can sulphate. The plates get a coating on them which does not conduct. Initially as the coating forms the functional area is reduced, meaning regardless of what the label says the battery is getting smaller, and will perform as a smaller battery.

If the battery reads 12V after the battery tender indicates it is charged either the tender isn't working right or the battery has a bad cell. Same if you run the bike riding around for 10 minutes or so. If the battery reads below about 13V after charging it is suspect.

If a battery has been allowed to run dead a few times it can sulphate. The plates get a coating on them which does not conduct. Initially as the coating forms the functional area is reduced, meaning regardless of what the label says the battery is getting smaller, and will perform as a smaller battery.

thanks looks like it mite be time for a new battery , im taking it to work to put a load test on it and see ,

I'm not sure the smaller lithium ion's will start his 475..

Erling

People are using the 5Ah in 1100cc street bikes. The starting pulse is greater than a larger lead acid can manage.

A 2.5Ah starts my 400 just fine.

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