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95 850 radio fuse #7 blown constantly, always 12V at fuse Topic is solved

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erikv11
Posts: 11911
Joined: 25 Jul 2009, 14:03
Year and Model: 850, V70, S60R, XC70
Location: Iowa
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Post by erikv11 »

I managed to sort this out today before I hit "post" for help, but here is the problem and resolution:

95 850 R with factory amp at radio/heater core area and CD player in trunk.
Radio fuse (#7) blows instantly, key on or key off doesn't matter. Constant 12V across the socket according to my meter.
Removed radio and ECC unit and an't see any frayed wires at all in the radio/climate area.

What I did
- searched a bunch of old MVS threads
- found a post in this one really useful, by fazool (viewtopic.php?t=45058) explaining that power comes in from fuse #7 on two red-black wires
- after a series of "well it's not that" attempts (unhooking radio itself, CD player, etc. connectors) I figured out that unplugging the amp solved the problem. Amp is accessed from the driver's footwell.

Looks like a dead amp, not sure I will ever get to investigating that any further. Since the amp harness just plugs in between the regular harness, I could easily just switch back to un-amped setup and the radio makes noise again.
'95 854 T-5R, Motronic 4.4, 185k
'98 V70, T5 tune-injectors-turbo, LPT engine, 304k, daily driver
'06 S60 R, 201k
'07 XC70, black, 205k
'07 XC70, willow green, 223k
gone: '96 NA 850 210k, '98 NA V70 182k, '98 S70 NA 225k, '96 855 NA 169k

User avatar
erikv11
Posts: 11911
Joined: 25 Jul 2009, 14:03
Year and Model: 850, V70, S60R, XC70
Location: Iowa
Has thanked: 311 times
Been thanked: 817 times

Post by erikv11 »

Option for MVS member amp repair: viewtopic.php?f=6&t=91782
'95 854 T-5R, Motronic 4.4, 185k
'98 V70, T5 tune-injectors-turbo, LPT engine, 304k, daily driver
'06 S60 R, 201k
'07 XC70, black, 205k
'07 XC70, willow green, 223k
gone: '96 NA 850 210k, '98 NA V70 182k, '98 S70 NA 225k, '96 855 NA 169k

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