I have a 91 explorer with the 4.0 auto trans. If I leave it set for 2 days and not start it the battery is dead. I have done some reading about trying to find a short with the test light hooked to the positive batter cable and then touch the test light to the positive battery post and if it lights up you have a short. Then you can start pulling fuses one at a time until the light goes out and the short should be in that circuit. I started pulling fuses from the fuse box under the hood that sets on the right inner fender. I pulled the 2-15amp fuses that set towards the read of the fuse box, light still on. Next I pulled the the 30amp fuse for the fuel relay, light still on. Next I pulled the 40amp fuse for the head lamps and the light dimmed a bit but still on. The light didn't go off until I pulled the 60amp fuse that was in the E.E.C. relay spot, but the fuse box cover says that the fuse for the EEC relay should only be a 30 amp.The fuse was in the 8th spot from the rear of the box forward and thats where the fuse is suppose to be for the EEC but the fuse right behind that one is suppose to be a 60 amp fuse for the ALT. PWR 1. I don't know why someone would put a 60 amp fuse in place for a 30 amp? What is the EEC relay and what does it do? What is ALT PWR 1 in the fuse box and what does it do? Thanks for any and all info!!!!!!!Larry

 

EEC relay provides power to the powertrain control module (PCM) and I believe also provides power to the fuel pump relay. If either relay sticks on it could drain the battery pretty quick. I am concerned however that the fuse was a 60 rather than a 30, so perhaps it was really the ALT power fuse. Try putting them back in and unplug the voltage regulator lead off the alternator and see if the light dims dramatically or goes out.

 

Thanks for the reply HomerWinzlow,
I'll double check the placement of the 60 amp fuses. I will try what you said about unpluging the voltage regulator lead off the alternator and see if the dims dramatically or goes out.I'll let you know what happens. Thanks for the info...........Larry

 

springer9861,
this sound very familiar. Just went through something alot like what you describe.
From a manual the f-8 fuse for the EEC is thirty 30 amp and the one behind it as you describe F-7 should be for power seats 60 AMP (according to both diagrams in my book)

About the other, both the underhood bulb and the ALT field get power from the headlight curcuit. If you have the underhood bulb in place (and it's working) that will acount for the dimming of the test light when you pull the headlight fuse.
My problem was a bad voltage regulator which gets it power through the Y/w wire from the 15A fuse at the rear of the fuse box your working with.

So, ATL PWR 1 would mean alternative power source for power seats and not alternator?