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2004 c70 radio in and out

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

1992 - 1997 850, 850 R, 850 T5-R, 850 T5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70

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Joined: Mon Oct 14, 2019 5:46 pm
Year and Model: 2005 c70
Location: Georgia
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2004 c70 radio in and out

Post by Bryonpayne » Mon Oct 14, 2019 6:01 pm

2004 c70 54k miles. Bought with interior in bad shape all speakers were physically cracked. Only center pro logic worked. Got new speakers from 2003 c70. Speakers come in and out, 1 second play,15 seconds off, this goes on and on. When they play for the second the lights will dim a little, when it cuts out, lights come back up. Tested battery and alternator with code reader and runs around 13.4 at 2k rpm with lights on. Turned radio on also and voltage didn’t really drop. Never got above 13.5. I read somewhere needs to be at 14 to be good charge. Amp is 4x100. Is it pulling the system down to the point it cuts the radio out and when voltage comes back up and speakers play again for a second then back off.
Battery, alternator, voltage regulator or grounds maybe? What should alternator put out. How many grounds on this car, never had this model. Otherwise it runs very well.

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