Campervan leisure battery help
Hi all,
I have a campervan with an AGM leisure battery and electrical system I installed myself (system itself was designed by a company). Everything has been working fine apart from my charging system from the starter battery. Old non-smart alternator therefore I installed a VSR (voltage sensitive relay) for battery to battery charging. So I have a thick cable directly connecting my starter battery positive to leisure battery positive via the VSR and 2 high ampage fuses. This initially worked great, when I turned the engine on I could see the voltage of my leisure system jump up to 14.2V. 6 months down the line its stopped working and I've no idea why, I've tried the following:
- tested ground connection for starter battery with engine off and on, looks good.
- tested ground connection for leisure battery, looks good.
- tested the end of the cable (including the 2 fuses but not the VSR) run going to leisure battery against ground, reading 14.2V.
- above test implies to me the fuses are good. Also swapped in different fuses, no difference.
- tried bypassing the VSR and connecting the +ve cable from starter directly to +ve terminal of leisure battery but no change, still read 12.5v across leisure battery terminals.
I'm now completely out of ideas. Possibly an issue with the battery? Or a ground connection? Please help!