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

Help, Advice and DIY Tutorials on Volvo's P80 platform cars -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, including 850 R, 850 T-5R, 850 T-5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70

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erikv11
Posts: 11800
Joined: 25 July 2009
Year and Model: 850, V70, S60R, XC70
Location: Iowa
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95 850 radio fuse #7 blown constantly, always 12V at fuse

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, 197k
'07 XC70, black, 205k
'07 XC70, willow green, 212k
'99 Camry V6 :shock: 153k
gone: '96 NA 850 210k, '98 NA V70 182k, '98 S70 NA 225k, '96 855 NA 169k

User avatar
erikv11
Posts: 11800
Joined: 25 July 2009
Year and Model: 850, V70, S60R, XC70
Location: Iowa
Has thanked: 292 times
Been thanked: 765 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, 197k
'07 XC70, black, 205k
'07 XC70, willow green, 212k
'99 Camry V6 :shock: 153k
gone: '96 NA 850 210k, '98 NA V70 182k, '98 S70 NA 225k, '96 855 NA 169k

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