78 bus FI starts well, idle well, stalls as pushing pedal

[hamid]

no, this black wire comes out of the harness. I know the blue wire coming out of the regulator. I think that goes to the ignition light. this black wire traces back to the alrternator. so there are four wires coming off of the alternator. three of them red green and brown go the regulator. this one goes no where.

i was just reading it may be a test wire? what kind of test

[Tram]

Right- look at the big red plug in current track 64 here:
https://www.thesamba.com/vw/archives/info/wiring/baybus_77-78.jpg

That wire likely went into that connector for VW Diagnosis. If the end is bare tape it off.
_________________
Немає виправдання для війни! Я з Україною.

[hamid]

thanks a lot for your input. ok so that wire is not the problem. this alternator is brand new. according To what i read there either a short in harness or internal short in the alternator. how is the alternator grounded? I have been noticing with old alternator or the new one that at night I could see a very dim flickering of the ingnition charging light but I thougt may be just because the headlight were on and I did not pay attention to it. is it possible that the charging issues has got to this point that first it affected the FI operation system and now there is a short?

how do I check for that? thanks

[hamid]

is it wise or safe to drive this car for 20 miles with regulator disconnected so I can get it to the mechanic shop to have the darn thing fixed properly, hopefully?

when they say that there is a short in alternator wiring what does that mean? why is it charging with high output? thanks

[Tram]

[Tram]

[hamid]

thanks man. I will do that. it must be one or the other. it couldn't be harder than figuring out uncommon illnesses. I will work on it tomorrow. thanks a lot.

[hamid]

ok today I got a new volt meter, new Beru regulator and did the following:

tested the battery it reads 13.2 volt

tested the regulator. D+ 1.5v when the ignition is on and engine off
DF 0.0 volts
D- 0.0 volts

turned engine on at idle, the ignition light still flickering. i measured battery it reads 13.7 V
D+ reads 16.5 volts!!!
DF reads 7 volts

I open throtle: the battery reads 16 volts, the ignition light is full red, the D+ reads 16 volts

I cannot see the connections of the harness to the alternator. if I have to take it off to check it, I have to tow it to mechanic. any suggestions

just to mention the the initial problem still there but let intense, I mean it stalls but with less abrupt cut off.

any help? thanks

[hamid]

so it seems that is regulated at idle but not at high RPM, althought the votage at D+ is always 16volts. does not make sense

[Tram]

[hamid]

Thanks a lot for your input. I will do one more thing. I will swap the battery for a new one just in case this one is fried. then I will take it in. thanks. will report back to you.

[hamid]

yes the new alternator was installed by the mechanic as he was putting everything on before installing the engine into the bus few weeks ago.the harness is original. as I recall now he was talking about a similar problem nad had also replaced the regulator. he had mentioned the battery was bad and put in his own battery. but at the end he told me that he reinstalled my battery( that he had told me was no good!).

anyways new battery and checking all the connection at battery, starter will be all I will do before taking it in.

[Tram]

[hamid]

is this strap different than the one that goes from battery negative to the wall?
if yes where is it? if no I will inspect the one that goes from negative pole to the body below the ECU area.

[hamid]

is this strap different than the one that goes from battery negative to the wall?
if yes where is it? if no I will inspect the one that goes from negative pole to the body below the ECU area.

[Tram]

[hamid]

i found it. its in a horrible shape!!! all oiled and rusted oh my God !! what an idiot i am did not know about this. I have been under the bus thousand of times. I will get to it tomorrow. these are the last chances. thanks man and take care have good night. I will report back to you.

[EdZ KG6UTS]

[quote="williamM"]You might have a vacuum leak in the brake booster system.

That was what I had!!! Also if you get into the electrical connectors try 'DeOxit' by Caig Industries. Probably the best contact cleaner out there which also bonds to the connectors to prevent further oxidation. Do a sesrch for Caig or DeOxit.

EdZ KG6UTS
_________________
1974 Westy, Brilliant Orange

[TomWesty]

[quote="EdZ KG6UTS"]

[hamid]

ok restored the ground strap cleans all .checked all connections. new battery, new regulator.

checked the regulator again. 16 volts at D+, 7 at DF, 0 at D-, 13.7 at battery ignition light dim flickering when idling

16 volts at D+, 7 at DF, 0 at D- 15-16 at battery, the ign light full red when opening the throttle.

now I give up. I have done all I could. unless someone has any suggestion. just to mention that at this point the initial stalling problem has disappeared until when I do not know perhaps until the regulator gives in or something else electrical burns. thanks