I’ve been having an issue where my truck dies over night. Went got the battery charged then I went and got it tested the battery alternator ect were all good. car battery drainage issue didn’t stop, and I’ve made some progress. I went around my truck, checking for anything, that could be causing the problem. And I found several fuses that were draining my battery. I took them out to not drain my battery. It turned out to be the Ac Clutch Solenoid, PCM Memory, Cigar Lighter, Data Link Connector (DLC), Battery Saver Relay, Auxiliary Relay Box, Restraint Central Module (RCM), Generic Electroic Module (GEM), Instrument Cluster and my radio fuse. I’m not sure how to fix them and put the so they don’t drain my battery when I put the fuse back.
any advice would help.

 

WHAT YEAR is you Ranger?

Put all the fuses back in

After you get home and battery is charged from driving, disconnect one of the battery cables from the battery, either one is fine
Then the next morning hook it back up and see if battery is OK
If not then its self draining, replace the battery, period, whoever tested it was wrong
If you have a volt meter you can test it after battery has sat for 3 hours, 12.3v to 12.8volt is an OK battery but wait and test it again in a hour, if its lower then its self draining, replace it

If battery is OK and starts engine then you do have a circuit drawing too much power with key off doors closed
You need a amp meter and some patience, pulling fuse can help but, if you have a Battery Saver Relay and GEM module(1995-2003 Ranger) then you have to wait 20-30min for the vehicle to shut down

Ranger with computer(PCM) and radio should show an amp draw of 0.04A(40mA) with key off doors closed after 30min, its for holding memory
If you have keyless entry then 0.07A(70mA) after 30min, keyless entry needs to be on 24/7 so it can unlock the doors when you press the fob button

0.07A draw will drain a good battery in about 8 months

GEM is on, as is battery saver circuit, until GEM goes to sleep, 20-30min, GEM turns off Battery Saver relay

Cigar lighter and DLC are the same fuse, do you have something plugged in to Cigar lighter or AUX port, i.e. a phone charger?
This circuit has 24/7 12volts it doesn't shut off with key off

 

I have a 2003 Ranger I did charge the battery and disconnect it as you suggested the next morning it started up. I went around with the multi meter still got fuse on the radio it show an amp draw, I did upgrade my stereo to get Bluetooth I replaced it months ago it wasn’t an issue till now. For the cigarette lighter I don’t have anything plugged in anymore, I’m going to try plugging the fuse back in and see. For the PCM I’m not sure what’s causing it to draw power. Any advice would be helpful thanks in advance.

 

The radio and PCM always draw power
Radio needs to hold clock and pre-sets
PCM holds "learned" memory
Both combined are only 0.04A, 40mA, so might drain battery in 8-10months

Keyless entry, fobs, draw another 0.03A if so equipped, so total would be 0.07A, 70mA, so 6 to 8 months before there is an issue

Glad Battery tested OK, but now the hard part

Here are the power diagrams