FUSE F5 Problem

racerock3 · 10th March 2015, 12:00

Hi Guys,Checking out a ZT/T for a friend.Car battery drains overnight.Checked Current drain on Battery and found to be .450m/A.(the car appears to work OK
all functions)Pulling fuses in turn pointed to fuse f5 as the culprit,which I know is a feed to the BCU,but I cannot understand the drainage if things seem to be OK.Any help of course is welcome.NB When fuse f5 is pulled current drainage is an acceptable .045m/A. Regards David

bl52krz · 10th March 2015, 22:16

Perhaps the BCU is feeling poorly. Don't know how to check it but someone will be along I am sure with a how to soon. Best of luck.

SD1too · 11th March 2015, 07:26

Quote:

Originally Posted by racerock3

Current drain on Battery and found to be .450m/A ... When fuse f5 is pulled current drainage is an acceptable .045m/A.

David,

I don't think that you're reading your multimeter correctly. Have you selected a 10 amp range and the screen says "0.450"? Just to check, you have got the meter probes in series with the battery cable haven't you?

Simon

Lacy · 11th March 2015, 07:34

Is one of the interior lights staying on? Boot light perhaps?

racerock3 · 11th March 2015, 17:35

Hi guys,thanks for your comments I guess I know about meters ranges and connectivity(electronic engineer for 50 years(not Auto).lol but thanks, you were not to know..I do have the answer,as I said in the OP,I am looking at a friends ZT/T.the problem turned out to be the windscreen wiper motor connections being gunged up resulting in a partial short ,which would not allow the BCU to shut down in to sleep mode.Accidently found this when doing the Plenums (horrible state,don't know how he got away with it)Car has been stood two days and static volts,are 12.65.so I reckon job done.Regards David:

Doc Evil · 11th March 2015, 21:28

Nice one David very satisfying to find and fix things like that
I hate to think how much a garage would charge for that
Doc

10th March 2015, 12:00	#1
racerock3 Passed Away Rover 75 Connoisseur Join Date: Jan 2009 Location: Milford Haven Posts: 160 Thanks: 36 Thanked 54 Times in 16 Posts	FUSE F5 Problem Hi Guys,Checking out a ZT/T for a friend.Car battery drains overnight.Checked Current drain on Battery and found to be .450m/A.(the car appears to work OK all functions)Pulling fuses in turn pointed to fuse f5 as the culprit,which I know is a feed to the BCU,but I cannot understand the drainage if things seem to be OK.Any help of course is welcome.NB When fuse f5 is pulled current drainage is an acceptable .045m/A. Regards David __________________ David

10th March 2015, 22:16	#2
bl52krz This is my second home Rover 75 cdt club + Rover 2.5 KV6 Conni SE Join Date: May 2008 Location: Birmingham Posts: 11,445 Thanks: 6,587 Thanked 2,262 Times in 1,729 Posts	Perhaps the BCU is feeling poorly. Don't know how to check it but someone will be along I am sure with a how to soon. Best of luck. __________________ Great Barr, Birmingham.

11th March 2015, 17:35	#5
racerock3 Passed Away Rover 75 Connoisseur Join Date: Jan 2009 Location: Milford Haven Posts: 160 Thanks: 36 Thanked 54 Times in 16 Posts	Hi guys,thanks for your comments I guess I know about meters ranges and connectivity(electronic engineer for 50 years(not Auto).lol but thanks, you were not to know..I do have the answer,as I said in the OP,I am looking at a friends ZT/T.the problem turned out to be the windscreen wiper motor connections being gunged up resulting in a partial short ,which would not allow the BCU to shut down in to sleep mode.Accidently found this when doing the Plenums (horrible state,don't know how he got away with it)Car has been stood two days and static volts,are 12.65.so I reckon job done.Regards David: __________________ David

11th March 2015, 21:28	#6
Doc Evil Gets stuck in Rover 75 1.8 Classic Saloon Join Date: Jan 2014 Location: Newton Abbot Posts: 823 Thanks: 46 Thanked 175 Times in 144 Posts	Nice one David very satisfying to find and fix things like that I hate to think how much a garage would charge for that Doc __________________ NOT EVIL REALLY BUT REALLY A DOC

11th March 2015, 07:34	#4
Lacy Regular poster None Join Date: Apr 2012 Location: Bromsgrove Posts: 46 Thanks: 12 Thanked 12 Times in 9 Posts	Is one of the interior lights staying on? Boot light perhaps?