Not charging

[RLS]

Have a 06 Meridian with a C7. Went to get get ready to head south and its and not charging. Check info Ctr light came on voltage was showing 11.8 bouncing up and down to 12. 4 or 5. Took to local Freightliner dealer, they replaced the alternator. Drove home started acting up again took back to Freightliner dealer. They trouble shot thought was a bad cable from alt to batt. Added a second line Gage 3 wire. Drove home noticed that as I accelerating the voltage would drop. The faster I went the lower it went, at cruising speed about 62/63 voltage would be in the low 12s . If I let off the gas it would climb back up to around 13 volts. Call Freightliner back up, they thought it might be a slipping belt, went back and got a new belt, replaced belt. No improvement. Anyone have any ideas?

[Ranger Smith]

Maybe a bad ground

[twinboat]

You have to be kidding.

Find a different dealer and demand your money back.

Maybe call a mobile mechanic.

Some Cat engines run the alternator off the fan hub. The fan is run off a pair of belts from the crankshaft.

If they slip the fan slows down. This in turn slows down the alternator.

If you have this arrangement you probably need the fan belts adjusted or replaced.

[RLS]

Found the problem. The mechanic that installed the alternator did not tighten the nut on the ground. I tightened it and all is fine.

[1ciderdog]

Glad you resolved the problem. Safe travels.

[Dolphin32]

The incompetence around us is maddening!