Weird electrical problem with my Mondeo

Soldato
Joined
2 May 2011
Posts
10,966
Location
Woking, Surrey
Hey everyone,

I've inherited a 1997 Mondeo TD and over the last couple of days have been trying to fit a new radio. I bought it from Halfords so in the end I went back there and this chap fixed it up for me (and somehow didn't charge me!!). While sorting it out he found a very strange problem...

For some reason the voltage of the power supplying the radio (and I think the 12v cigarette lighter thing) began at 7V and crept up to about 11V. We never got to 12V because it took so long.

Now, before I go to a garage, has anyone got any idea what the cause of this might be?!

Thanks in advance,
dirtychinchilla
 
Associate
Joined
26 Jul 2010
Posts
1,705
Location
Wiltshire
it seems odd if both circuits are low as they are fed from different fuses.
I'd check the voltage at the fusebox supply in the glovebox and go from there presuming battery voltage is o.k.
 
Soldato
OP
Joined
2 May 2011
Posts
10,966
Location
Woking, Surrey
With or without engine running?

With the engine running.

it seems odd if both circuits are low as they are fed from different fuses.
I'd check the voltage at the fusebox supply in the glovebox and go from there.

Hmm well it may have just been the radio circuit to be honest, I think he might have grounded it on the cigarette lighter...

Hmm OK, no idea how to do that but I'll think about it!
 
Associate
Joined
26 Jul 2010
Posts
1,705
Location
Wiltshire
There will be a big fat red wire going to the fuse box, touch your multimeter probe on the connector where it screws onto the fuse box. Should be above 12v

I'll try to find a photo
 
Associate
Joined
31 Jul 2011
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206
If you have less than battery voltage, you will have a bad connection somewhere increasing the resistance.
 
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