HELP! - 78 Euro w/ 4.7L euro engine

1. The alternator was replaced, but with all 3 new alternators, when the car got hot, it cut off, especially with accessories on. With no accessories on, it will idle for a few minutes, then quit.

2. Mechanic rebuilt last alt w/ higher amperage, but still cuts off when it gets hot with accessories on.

3. Every now & then, the voltmeter will hold at 12v for about 5-10 minutes, during which it idles fine, then it drops to between 10-11v & quits. Idles better when cool at night.

4. Replaced the air cooling hose & added a mini fan from a Mini Cooper. Throttle wire/assembly, fuel filter, & fuel distributor were replaced.

I've read the tech advice on alternators, but I'm wondering is there something we're missing? When I bought it last October, I drove it cross country, running all accessories with no idle problems.

My immediate thought, perhaps not informed enough, is that the 928 be reviewed for problem with grounds. Drains are very common in 928s due to corrosion and faulty grounds.

Perhaps it isn't the alternator that is the problem but rather the draw in the car is too high....

Yeah, I would definitely check my connections first if you're certain that the alternator is fine. Sounds frustrating.

Also to expand on the bad connections.

A poor connection causes heat which uses more power.

I had a week charging system and so I replaced my alternator as well, But,
even though I had tested the battery and charged it many times, it was part of the problem.
I bought a deep cycle jell cell battery and have never looked back.
I still have some poor connections but my car runs strong.

Clean the ground terminal on the battery, Both ends. Take them off and use sand paper.
Do the same to the engine ground on the right rear of the engine, Both ends.
you can get anti oxidation paste from the local auto store. Tell them it is for aluminum wiring.

You can also take a bolt down to the store with you and get some of those star washers that fit but only put one between the bolt head and the cable, not between the body.

Have you ohmed out the Battery Ground strap? Or any of the main wires supporting and connections. (you need to disconnect the battery first!)

My mechanic checked all the connections before we got tech tips from you guys and the tech list, because he didn't want to pull the dash for no reason. We also found the exit wire from the fuse board was too small and replaced. Also rebuilt alternator for higher amperage.

Shouldnwe be concerned about replacing/rebuilding the voltmeter?