Need help: Short on Fuse 21 - Battery Drain

[E30RoadKing]

Alright, I need some help with a short in my car. The battery drains in about 2-3 days. I pulled the battery cables and put the positive lead off my multimeter to the positive cable and the negative lead to the ground cable. Using the continuity feature of my multimeter, it beeped which I believe indicates a short. I started pulling fuses, and the beeping stopped at fuse 21, which is a 7.5a that controls the interior lights, tachometer, truck lights, OBC and radio memory. I disconnected the radio and OBC and tried this test again and it still beeps until fuse 21 is pulled. How can I test the other circuits hooked to this fuse to find the culprit?

My multimeter is a Craftsman Digital Multimeter Model 82141. Looks exactly as this one I'm attaching. Not sure what most of these functions do.

[bobdavisnpf]

Sorry you're not getting much traction here. I've been holding off due to how bad my advice is likely to be :D but here goes...

I think troubleshooting continuity to ground on the rest of the circuits will be a more laborious process - going after each circuit in turn. Much easier when the car is stripped of interior, kick panels, door cards, etc. For a "drains every 2-3 days" issue, if it's otherwise running reliably, I'd leave it as-is and wait for bigger problems to arise.

Your multimeter has a whole lot of bells and whistles but the continuity tester is the only one that matters for the exercise you're doing. Another approach might be to use it to track voltage level as you turn various things on and off; that can give you some hints as to where the voltage drain(s) happen. I've done that with far simpler multimeters than yours, though my ability to interpret the results is poor.

[ForcedFirebird]

Check the flashlight charge port in the glove box. I had a car that had something fall in there and was shorting it out.

From my notes, Fuse #21 is flash light charger, boot light, glove box light, dome light, OBC/clock memory, radio memory.

Put your meter on the little "10A" white box next to "ADC" (10amps, Amps Direct Current). Connect the battery ground. Then use the meter to test between the positive battery terminal and battery positive lug without actually hooking it to the battery. This will tell you how many amps you are drawing with car off. Note the difference when you pull the fuse.