FICM tuner

[f100cleveland]

Got a ficm tuner from inovative diesel. It seems to make the drivability off idle to mid range more responsive. The mileage on the lie meter is 1.5 to 2 higher than it usually is so guess time will tell if it was a worthwile investment. The only problem installing it was low battery voltage the first time I tried. After hooking up a charger it loaded. What should my voltage be after a 15 minute drive with no lights drawing. I had 12.1 volts. Couple year old Ford batterys.

 

[DaveBen]

Somewhere closer to 14 volts is normal. Yours is too low. Have the batteries checked.

Dave

 

[f100cleveland]

I was wondering what it should be not running. I get 13.8 volts running. 12.1 volts didn't seem like it should be low for a 12 volt battery but the tuner said low voltage and wouldn't load tune.

 

[W4RLR]

12 volts with no load is too low. Practically marginal in fact. A normal "12 volt" system is actually closer to 14 volts when the alternator is running. I think your batteries are on the way out. Load test them and if they are bad, replace them in pairs.

 

[f100cleveland]

Today after work batterys read 14.1 running and 12.1 right after I shut it off. Did a little checking and they should be 12.4 or more. Have a 36month free replacement on
ford oem batterys but I'm sure they will sock it to me to check and replace them.

 

[Smoky]

Fords quicklane normally checks their batteries for free way down here.