Hello,

I could really use some advice.
I have a battery drain where the batery lasts 5-6 days undriven, and using my multi, i determined it was tied to #6 40A fuse under the hood.
#6 indicates Instrument Cluster / Powertrain Control Module.
So i removed the cluster, and unplugged the PCM.

Parasite is still there, how do i proceed after trying these two basic tests?
2003 mach1

 

You'd have to check out a wiring diagram to see exactly what circuits that fuse powers then check those other items. . PCM and cluster is vague. There's more than one fuse that affects both.

 

Thank you for taking the time to provide your advice.
I've got the service manual with the wiring diagrams, is there a way to determine which circuit pertains to Fuse #6?
How can i determine which circuit diagram to focus on?
I could upload but not sure which circuit/pages

These are all the circuits for the mach1:

Air Conditioning Circuit
Ant-Lock Brakes Circuit
Passive Anti-Theft Circuit
Body Control Module Circuit
Computer Data Lines Circuit
Cooling Fan circuit
Cruise Control Circuit
Defrogger Circuit
Engine Performance Circuit
Backup Lamps Circuit
Exterior Lamp Circuit
Ground Distribution Circuit
Headlight Circuit
Horn Circuit
Instrument Cluster Circuit
Courtesy Lamp Circuit
Instrument Illumination Circuit
Power Distribution Circuit
Power Door locks circuit
Power Mirrors circuit
Lumbar Circuit
Power seat circuit
powertop/sunroof circuit
Power Window circuit
Preium Sound Radio Circuit
Shift Interlock Circuit
Charging Curcuit
Starting curcuit
Supplemental restrains circuit
A/T Circuit
Trunk, Tailgate, Fuel door circuit
Waraning system circuit
wiper washer circuit

 

Found the parasite:
Fuse 39 5A GEM

Once I yanked that bugger, the drain stopped!

 

Taking a fresh attempt now using the diagram.
Fuse 39 5a is yellow, bottom right in diagram 3.
On that same block are the following:
---
Fuse 33 - Deactviator Switch & Brake Pedal Positioning Switch
Fuse 27 - Radio
Fuse 21 - Instrument Cluster, Powertrain Control Module
Fuse 15 - Left Front Lumbar Adjust Switch
Fuse 9 - Front Subwoofer Amplifier and Rear Subwoofer Amplifier

It says 'from splice s260 on diagram 1 of 3' under the hood:
Fuse 13 - Electronic Flasher Module
Fuse 6 - 40A

It says 'To fuse 27 Diagram 3 of 3'
Fuse 27 - Radio
--
I am going to remove Fuses 13, 33, 27, 21, 15, 9 and re-test after 45 mins.
I don't have aligator clips, i hope i'm not waking it up by when using the multi.

 

Glad to see you’ve made some progress. It is possible the GEM (module) itself is bad (fuse 39a) This is similar to the Smart Junction Box of the s197 models (2005-2014) if they get water or just age and crack, you get all sorts of gremlins or shorts.

Otherwise, my guess is on the radio circuit. Any changes or splicing going on in that area behind the dash!