2008 Peugeot 308 Car sometimes doesn't start

Peugeot 308 Problem
The Problem

Car sometimes doesn't start
Aug 27, 2019 (5 months ago)
This video shows the issue (ignore the pulsating lights, it's just my phone camera doing that) https://www.youtube.com/watch?v=RVDjcapr0Fw

Every now and then, my car refuses to start. It'll work fine if jump started and then will work for a few days normally.

I was jump started yesterday morning and did 2 medium length drives before I parked up at home. I woke up this morning and my car was having the same issue.

The alternator has been tested & the mechanics also said the battery was fine as far as they could tell.

I was thinking it was maybe an immobiliser issue?

Car details
Car: Peugeot 308
Model Year: 2008
Category: Electrics, ECU, Warnings & Lights
Running Rough, Starting & Power Loss

Recalls: Peugeot 308 Recalls
More: Peugeot 308 Problems
Parts mentioned in this problem
Replies and solutions
Fixes: 12,234
Aug 27, 2019 (5 months ago)
" the battery was fine as far as they could tell. " !!!! Surprised the garage dont have a battery load tester which will tell if battery faulty or not for definite . Alternator also needs LOAD testing .Does sound lika battery low or possibly weak cell which will show when load testing .
Fixes: 1,666
Sep 3, 2019 (5 months ago)
check earth lead and also check the positive connection is good
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