Battery Drain -Underhood Fuse

neffer · #1 03-05-2008, 03:07 PM

I do have a short somewhere that is draining the battery. I connected a multimeter in series with the negative battery post and have a reading of over 200 miliamps. Pulled each fuse in the block inside the car with no change, disconnected the alternator-no change. SBF #4 fuse located in the fuse block under the hood if removed will change the reading. Diagram shows wiring going to the ignition switch. With fuse removed I get a no start or no dash lights which is expected. Anyone have a clue what is connected through this fuse or anyone else had a short at this location? Any help at this time would be appreciated. Thanks

Trevor · #2 03-05-2008, 05:19 PM

Quote:

Originally Posted by neffer

I do have a short somewhere that is draining the battery. I connected a multimeter in series with the negative battery post and have a reading of over 200 miliamps. Pulled each fuse in the block inside the car with no change, disconnected the alternator-no change. SBF #4 fuse located in the fuse block under the hood if removed will change the reading. Diagram shows wiring going to the ignition switch. With fuse removed I get a no start or no dash lights which is expected. Anyone have a clue what is connected through this fuse or anyone else had a short at this location? Any help at this time would be appreciated. Thanks

The manuals show that fuse No. 4 supplies the fog light circuit which is quite complicated. A drain of 200 milli amps is hard to fathom. You must accept some residual standing current to maintain clock and computer memories. How much does the reading change after removing fuse 4.

While registering the current drain, try removing the fog light relay and observe results and report back. If the drain changes it will put some of the circuitry out of the suspect area. Damp spider webs or whatever, behind the fog lights are a thought.

neffer · #3 03-05-2008, 07:47 PM

No 4 is the fuse located on the fuse block inside the car under the dash panel. The Fuse in question is the SBF No 4 located in the engine compartment fuse panel which when removed will drop the current draw. I am unsure where to start to trace the source of this short.

Trevor · #4 03-06-2008, 12:12 AM

Quote:

Originally Posted by neffer

No 4 is the fuse located on the fuse block inside the car under the dash panel. The Fuse in question is the SBF No 4 located in the engine compartment fuse panel which when removed will drop the current draw. I am unsure where to start to trace the source of this short.

Fuse SBF 4 (45 Amp.) supplies the ignition switch and everything controlled by the switch. There should be no current in this circuit with the switch off.

How much does the fuse drop the current draw when removed, i.e. what is the static drain when removed.?

YourConfused · #5 03-06-2008, 01:01 AM

What does SBF mean?

Suby Fan · #6 03-06-2008, 10:28 AM

Quote:

Originally Posted by YourConfused

What does SBF mean?

standard blade fuse?

lol or it could also mean:

cronym Definition
SBF Salvo Buon Fine (Italian: reduction in price effects subject to collection)
SBF Scholastic Book Fair
SBF Singapore Bowling Federation
SBF Single Barrier Failure
SBF Single Black Female
SBF Skin Blood Flow
SBF Small Block Ford (automotive engine)
SBF Social Brain Foundation (China)
SBF Société des Bourses Francaises
SBF Support By Fire
SBF Surface Brightness Fluctuation
SBF Swiss Boomerang Federation
SBF Synthetic-Based Drilling Fluid

Trevor · #7 03-06-2008, 03:51 PM

Quote:

Originally Posted by Trevor

Fuse SBF 4 (45 Amp.) supplies the ignition switch and everything controlled by the switch. There should be no current in this circuit with the switch off.

How much does the fuse drop the current draw when removed, i.e. what is the static drain when removed.?

SBF could mean Sub Board Fuse.

However could we keep trying to assist, in which case an answer to my post as above would be productive.

neffer · #8 03-06-2008, 05:16 PM

I once again pulled all the fuses both at the under the hood location and under the dash. SBF 4 is the only one that drops the currrent. Next I put a ohm meter between the positive battery cable and ground and got a reading but only on the cable that goes to the fuse box. The starter cable reads infinity. Disconnected the alternator again with no change.

SubaruSVXCrazy · #9 03-06-2008, 08:36 PM

Quote:

Originally Posted by neffer

I do have a short somewhere that is draining the battery. I connected a multimeter in series with the negative battery post and have a reading of over 200 miliamps. Pulled each fuse in the block inside the car with no change, disconnected the alternator-no change. SBF #4 fuse located in the fuse block under the hood if removed will change the reading. Diagram shows wiring going to the ignition switch. With fuse removed I get a no start or no dash lights which is expected. Anyone have a clue what is connected through this fuse or anyone else had a short at this location? Any help at this time would be appreciated. Thanks

Does it have power seat belts? Because in my 92 the power seat belt modual was fried.