Electric cooling fan dilemma

[nathan.hall1]

Awhile back I put an electric cooling fan in my EB, now I've had my bronco die (battery) on me a few times after I've been driving it around, i just got a new Napa battery, so do you think it's the draw of that fan that is killing it faster than the Alt can charge? I've checked voltage on battery off and while running it seems good, I know I need to wire the fan it so when I start it kicks off while cranking, I put a relay that kicks it on and off according to temp. I wired it into the fan wire of the painless harness, I'll have to get details on battery...maybe I bought too small of battery?

 

[ransil]

Check the charging while under load i.e headlight , fan and heater on.

 

[cldonley]

With everything on and the engine running you should have somewhere in the neighborhood of 14.4 volts at the battery terminals. If not, it will eventually run down. Always check battery cables for condition and security first before changing out a bunch of parts!

 

[Justafordguy]

Doesn't sound like a battery problem, sounds like a charging problem. Make sure the alt is charging first. If it is and still can't keep up, you may need a larger alternator.

 

[fuzzy2133]

With everything on and the engine running you should have somewhere in the neighborhood of 14.4 volts at the battery terminals. If not, it will eventually run down. Always check battery cables for condition and security first before changing out a bunch of parts!

Always a good idea to clean the terminals and cables with a new battery or if you have any doubt.

 

[Viperwolf1]

Also check the belt tightness. The higher the electrical load, the more torque needed to turn the alternator. Could be fine at light loads and slip at high loads leading to a discharged battery.