2002 S40T Battery size did you install?

[PLANT]

So nice sunny 20 degree day 3/4 tank of fuel. 304500kms service not due 307000km
New battery in car March 2023.
Have only driven short 5-10km distances with the odd 20 minute drive over past 6 months.
Car garaged overnight and it's been winter down here.. Australia.

Issues:
1. 28th April car stopped at Red traffic lights. Waiting in drive. Restarted straight away.
2. 1st May car stopped at Red traffic lights. All lights dollars in dash. Started straight away.
3. 16th May car stopped on reverse in garage. Noted coolant leak on floor.
4. 20th May car stalled at lights again.
5. 15th August Car driven from garage, parked. All lights no sound. Eventually started after 10 minutes.
6. 21st August drove 5kms parked, drove 10 km parked and in return to car all lights, no sound from engine. after multiple attempts and 20 minutes eventually cranked and then started.
7th 3rd September drove 5 km parked and then drove another 3km parked and car parked in sun. returned to car. All lights no sound. Battery light green, terminals clean.
Tried let different way, open glove box open door popped hood, all levels looked good, reading lights turn on inside car, moved brake pedal, moved auto gear change into neutral, drive park. handbrake in off. After about 15 minutes car starts and runs normal?

Drove the car 20+ minutes, stopped at traffic lights no issues after today's issue.

So things to check?
Electrical?
Fuses?
Wires/ cables?
Starter motor?
Alternator?

Looking like something in the LOOM going by this post thread: https://www.volvoforums.org.uk/showt...=144411&page=4

[PLANT]

So it happens again on 6th Oct.... lights no crank had driven car more than 10kms and parked for 10 minutes.

On opening the hood I touched the cables going to negative terminal(plastic had been melted in part) Also noted a small connector off positive battery terminal that attached to the air filter was not staying in its spot and tried repostioning that.
Car started.
Drive home and placed a plastic tie to keep the connector in place to the air filter and upright.

[PLANT]

12th October Garage to 5kms parked.
Can't back lights no crank, tried globe box, key in/out, brake pedal and opened hood and moved wires near battery and starter motor with hand.
Car starts drive 5 kms Park, return to car and starts fine.
Drive 2 km and park in underground carpark.
Away from car for 15 minutes come back and try everything 3 times with breaks in-between with no crank.
Walk away from car and lock.
Comeback with portable jumper.
Hop in car and car starts without even using jumper or opening hood?????
Drive home park in garage.
It's auto electrician time 🤷*♂️

[PLANT]

So going to have an Auto electrician look at it...
When I called he said well I'll have to see the issue occur?
I'd already told him it's sporadic.... suggested he might spot the issue on review with his vast experience 🤷*♂️

Suggestions/tips on what to say and point out?

[PLANT]

So taken to auto electrician.
Tested positive wire from battery and said dropping 1/2 volt... not an issue unless over 1 volt.
Showed corroded negative wire said never good and is replacing now.
Did wonder if heat issue causing no crank but lights.

Also said age maybe starter or solenoid worm out....

But of course it started flawless the 5-10 starts in shop today 🤷🙄

Edit: So I think I just got ripped off.... charged me 2hrs labour to replace the negative cable with aftermarket part... $198Au.

[PLANT]

So drive down into car Park.
Parked.
Came back to car, opened via fog.
All lights no ignition turn over again.
Battery terminals clean
Battery green and newish
Needed coolant to up.
Took 5 minutes to eventually get Crank and started.
Electrical? Battery terminals and grounding cables newly installed?

[PLANT]

Happened again today.

Drove 15 minutes with 3 stops.
Last stop, went inside for 1hr, car parked on up hill, 1/2 tank of fuel.
Came back to car key in ignition and lights and no noise.
Took key out put back in upside down. same
Locked car, glove box open, waited couple of minutes.
Key in upside down and started without issue.
Is it the barrel of key?
Solenoid or starter motor?

[ITSv40]

Have you had the car read by VIDA diagnostics? I would want to see if there are any stored codes which might give a clue as to what has been going on.

[magnuz]

Have you checked the immobiliser antenna connector ? Just removing the connector plug & pushing it back on can often solve this common problem ?