That does seem low to me... with your 170 amp alternator you should load test it with a carbon pile tester (puts physical load on the system, test in live conditions) If the local dealer only has the new "smart" electronic impedance testers it may be giving inaccurate readings by not putting a real load on the battery. I'd go to a shop with the old school VAT 40 load tester and have them test the system. Load test the battery at the battery posts at 1/2 the cca reading for 15 seconds... the voltage shouldn't drop below about 10.2 volts. Load test the alternator from the jumper points under the hood at 170 to 180 amps with the engine running at about 2000 rpms and you should get at least 180 amps. I've had cars in the past that tested great when cold, but after driving it for an hour the alternator wasn't charging for shit... could get weaker as you drive as well...

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