Interior Lights and 12v sockets not working - 65 Reg

[MwebbSureline]

Hi All,

Got a bit of a strange issue with our 65 reg transit custom.. The interior lights, both in the cabin and cargo compartment won't turn on I've also noticed the 12v socket in the dashboard and the media 12v socket next to the USB socket in the dash both aren't working.

I think I've identified the cause of the fault, but I'm not sure how to fix it. My understanding of this particular model of transit is that Fuse 25 (7.5Amp) in the Passenger Compartment Fuse box is used to throw Relay 2 which in turn controls both the lights and sockets. From testing I've found that with the ignition on and the van running the positive side of that fuse is only getting 3v which I don't think is enough to throw the relay, but I have no idea where F25 is fed from to further investigate this. .

I have checked EVERY FUSE in the Passenger Compartment Fuse with a continuity meter. I have swapped R4 (ignition) which is also a 70 amp 4 pin relay of the exact same model and I was able to successfully start the van so I don't think the relay is at fault. Every fuse in the Passenger Compartment Fuse board is getting 12v on the positive with the exception of F25 and F32. I have also popped all the lights out including the 4 x LED lights in the cargo compartment to ensure they're not shorting against something.All systems in side the van are working (air con, heated mirrors, heated windscreen, dashboard lights, SYNC, etc..)

I'm really stuck with this so I'm hoping someone on here will have a bright idea for something I missed

Thanks in advance guys!

[dumper]

I’m no electrician but what I’ve read on hear if the aux battery is on its way out it gives all sorts of problems also you led lights are they a after market fitting and giving a problem

[MwebbSureline]

Hi Dumper,

There's no Aux battery in our van, although it does have the connections for one. The lights are factory fitted by ford, I've found the same ones on Ebay:

https://www.ebay.co.uk/itm/Genuine-LED- ... :rk:2:pf:0

There's quite a few posts about these guys draining the battery. Our battery is on a Noco G7200 trickle charger

[dumper]

Was just a thought someone who knows a bit more about electronics will popup with a better idea my only outher thort is trying putting the old lights back in to see if that works if you have them

[bambi mk 1]

Testing the fuses with a probe is not a fail safe way of ensuring they are ok,you need to remove them and check the blades are not burned or corroded on the consumer side Had it a few times one modern vehicles

[ake]

The rule with any electrical fault on a Transit, is to check EVERY FUSE in every fuse box

[MwebbSureline]

Hi All,

Quick update on this, all fixed There's a fuse board just to the right of the Passenger Compartment Fuseboard, it's listed in the manual as Body Control Module although that's behind the glovebox!

Anyway... On the BCM fuseboard F13 was blown (On-board diagnostic. Battery saver.) Replaced this fuse and heard the relay click over!

TL:DR: BCM Fuseboard F13 is used to contol PC Fuseboard F25. j

[MwebbSureline]

Pics for anyone else that has this issue

[Ashleyteeth20]

Hi All,

Quick update on this, all fixed There's a fuse board just to the right of the Passenger Compartment Fuseboard, it's listed in the manual as Body Control Module although that's behind the glovebox!

Anyway... On the BCM fuseboard F13 was blown (On-board diagnostic. Battery saver.) Replaced this fuse and heard the relay click over!

TL:DR: BCM Fuseboard F13 is used to contol PC Fuseboard F25. j

This helped me out a treat dude! Thanks so much!

[rufus26]

Many thanks this post was a great help 12v sockets and interior lights now work