V90 Mk1 help needed

[Gordon Hunter]

Hi all,

I'm having some battery drain issues with my '97 V90 estate.
I have wired a multimeter in series to the positive terminal of the battery and with the ignition off it is showing a fairly hefty drain of around 1.7 amps...

20200812_162737 (1).jpg

Removing the third fuse from the right in the main fuse box in the engine bay gives me a more acceptable loss reading of 0.04 amps

20200812_162801.jpg

I have checked all the fuses in the box to the right of the steering wheel but the circuits all seem fine.

Putting the car up on the ramp with the ignition off, I can hear a faint medium pitched electrical buzzing (sounds like a Rolph Harris stylophone!).
Listening with a DIY stethoscope It seems to be coming from the N/S of the gearbox sump.

Until the issue is rectified I have installed a battery cut out switch.

This is about as far as I can get.

Can anyone please help me get to the bottom of the issue?

Many thanks in advance,

Gordon

[360beast]

What is the fuse for?

[Gordon Hunter]

That's what I'm hoping to find out.
It's fairly heavy duty AFAIR 50amps.
Could be supply to gearbox?

[taiwan740]

https://www.carknowledge.info/volvo-...ms-fuse-panel/

Should help - not sure what fuse you are talking about but this should clarify it.

[taiwan740]

or this now i can see the pictures after logging in! d'oh!

http://new.volvocars.com/ownersdocs/.../96960_613.htm

Number 6 is air pump (duno what that is), starter solenoid and the horn.

[Gordon Hunter]

That's really helpful. Thanks.
Horns are fine as I replaced them recently. No issues with the starter, so likely not the solenoid.
So looks like it's the air pump wherever that is?

[Gordon Hunter]

A quick trawl on Google was enough to help me identify it -it's for the emission system. I'll get the car upon the ramp again tomorrow, and see if there is a relay sticking that's causing the drain or try just disconnecting it.

[jor]

I cannot find working links for Volvo electrical diagrams any more - all removed at the request of Geely no doubt, but selify.com will provide you with one for a tenner.

jor

[Laird Scooby]

The fuse is referred to as 11A/6 in the diagram :

http://www.myvolvolibrary.info/Tech_..._98_Wiring.pdf

Don't ignore something just because it's relatively new, wouldn't be the first time (or the last) that a supposedly new component has failed.

Good luck.

[Clan]

Originally Posted by Gordon Hunter

Hi all,

I'm having some battery drain issues with my '97 V90 estate.
I have wired a multimeter in series to the positive terminal of the battery and with the ignition off it is showing a fairly hefty drain of around 1.7 amps...

Attachment 129946

Removing the third fuse from the right in the main fuse box in the engine bay gives me a more acceptable loss reading of 0.04 amps

Attachment 129947

I have checked all the fuses in the box to the right of the steering wheel but the circuits all seem fine.

Putting the car up on the ramp with the ignition off, I can hear a faint medium pitched electrical buzzing (sounds like a Rolph Harris stylophone!).
Listening with a DIY stethoscope It seems to be coming from the N/S of the gearbox sump.

Until the issue is rectified I have installed a battery cut out switch.

This is about as far as I can get.

Can anyone please help me get to the bottom of the issue?

Many thanks in advance,

Gordon

you must do that test 15 minutes AFTER locking the car , It should shut down then and give you the reading you expect 50 ma or less probably ..



Sorry forget that i thought you had a new V90 !