1998 V70 intermittently shuts down. Nothing works when this happens (no hazards, lights, starter, etc., dash goes glitchy with odometer flashing or not at all, only marker lights on doors work), and then some time later (minutes or hours) the car heals itself. Searched online for answers and most indications were that it was positive battery cables (A+ and B+). First renewed battery side B+ cable end. Seemed fixed for a few days. Then problem occurred again. So replaced both A+ and B+ cables with OEM cables. Seemed good for a day, then happened again. Volvo dealer is reluctant to do anything because no code comes up on the analyzer. Don't want to replace computer if not warranted. Friend says to now do the battery grounding cable.

How long have you owned the car? Has any thing happened to it recently?

A stab in the dark - Try wiggling the ignition switch around when the problem happens, or better yet, try it as soon as you get a chance.

Usually it is a ground problem. Check the battery ground at both ends, at the fender just in front of the battery shelf (blue wire). Also check the ground wires for the alternator and engine to firewall ground.

Thanks for the response. Your guidance is just what my friend suggested. Off to check/replace the grounds!