Technical Multipla Roof Bee Sting Ariel

[whizzer66]

Hi.
Anyone got a wiring diagram for a 54 plate new shape Multipla roof aeriel, Mine snapped off and when I tried to remove the snapped bit in the base it knacked up all together so I decided to replace it with a sharks fin type aeriel off ebay (this was so it didnt foul my roofbox when fitted) which said it was compatable with all fiats as an aftermarket refit. I stripped down and removed the old one, opened up the hole to accept the new one and fitted it, on checking (somewhat too late) The new one has 1 double core cable wired to a aeriel plug and a single red wire (No instructions with the unit) the unit I removed from the multipla has two cables wired to a small circuit board which was attached under the base mount in the roof, Where will I connect it to, Ive tried a couple of things but they didnt work I kept getting lost signal when driving not bad when stationary but searches the odd time. Any Ideas Please help

 

[momoe]

Google is your friend! It appears that later Multi's have a cellular aerial incorporated in the unit (triangular PCB).
New aerial sounds like it incorporates a signal amplifier which will need a switched 12v supply, assuming this is a cellular type - one of the wires will be a switched 12v supply and the other should feed to the ISO connector.
They may both feed from the ISO connector but only one will be 12v!

I've tried a couple of alternative aerials after having the same problem, I found that the Multipla unit isn't too shabby, either that or the aerials I got were carp.
If you've got access to another car, try the new aerial on that and check it works before spending any more time on the Multipla install.

 

[whizzer66]

Hi
Thanks for the info, I have installed it now but it doesnt work, Ive done a couple of searches and yes your right it is an amplified aeriel so I need to find a 12v supply in the roof lining any ideas where I could possibly take it from??
Regards
Bill

 

[momoe]

One of the existing wires supplying the old aerials PCB should be 12v switched, the old aerial was amplified so one of these must be a feed.
If not then you can either trace one of the two old wires down to the ISO connector and loop in a 12v switched feed there, or, use the 12v supply to the lights in the overhead console which is permanently live.

This would need to be fused and I'd also put a multimeter across this as if there's any drain you could end up flattening the battery if left for a period.