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Volvo wiring on 200 series cars can be challenging. My '83 DL which has 315,000 miles on her, was suffering intermittent dying. After changing the fuel filter, 25 amp fuse in the engine compartment, fuel system relay, and a number of other components, I noticed that the small red wire at the back of the alternator had frayed insulation, and was at the point of breaking in several places. This wire is connected to the ignition switch via the idiot lights on the dash. Remembering a similar experience a few years back, (that time it was the wire connecter just behind the right front wheel), I cut the sleeve through the red wire runs till I got sveral inches past any breaks in the wire and/or insulation, cut it off and replaced it with new wire. This apparently worked, as I haven't had the problem since (2 or 3 months). I understand that Volvo had gotten hold of some below standard wiring (bad insulation) and that wiring problems are quite common. Another source of frustration has been the fuses. They can look good, but have an almost invisible hairline crack in the metal link. And the holder for the 25 amp fuse in the engine compartment can deteriorate also. Another source of fun is the vacuum hose from the throttle housing to the LH unit. I re-routed it to go along the firewall, through the strut tower, past the overflow container, and to the LH unit. That way it's visible, and less exposed to heat, vibration, chemicals, etc.
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