Alternator Wire 566

[Csm Davis]

Why would alternator Wire 566 be unhooked and taped up? I have seen this on several trucks and now i am having an electrical issue and found it has been done on my wrecker.

 

[doghead]

I found this with a search for "Alternator Wire 566". And several other posts/threads.

From what I have researched, #566 prevents the starter from being engage while the engine is running. It seems this wire delivers whatever signal (voltage, freq.) to the protective control box (mysterious black box by the drivers side firewall) for this.

9 CIRCUIT 566 - Controls a relay in protective control box that prevents starter from reactivating</SPAN>
while engine is running.

 

[juanprado]

Jeff,

The P2P software shows wire 566 goes to terminal F on the PCB but it states that is not used. It does not show it doing anything internally in the PCB

 

[Csm Davis]

Thanks guys think my alternator was bad and messing with me I opened the little cover and the post 566 goes to fell out then I opened the rear and it was a mess! Will try new alternator and report back.

 

[Csm Davis]

New alternator in and charging but still having problems will try another black box tomorrow.

 

[Csm Davis]

Okay new black box worked, could the bad alternator have fried the second one or just a coincidence?

 

[Artisan]

I am NOT the person to ask but I have been told that
the Alternator itself is pretty much bullet-proof, and that
it is the Transformer-Rectifier that likes to BURN and be
problematic in the M915 Series of trucks.

So on PDF pg #84 in TM-9-2320-273-24P there is an
exploded view of the REGULATOR TRANSFORMER
With I believe part #8 being the REGULATOR,ENGINE GE
and part #22 being the TRANSFORMER-RECTIFIfier.

So those that were thinking about adding fuses to all
the wires in the cab can forget about the 566 wire, perhaps.

 

[Andy Bluelights]

New alternator in and charging but still having problems will try another black box tomorrow.

did you have a problem with under or over charging ?

 

[Csm Davis]

did you have a problem with under or over charging ?

Not sure Andy my gage was not reading and I didn't have my meter to test with just had to shotgun it by changing parts till it worked.

 

[Andy Bluelights]

So have we come to the conclusion wire 566 does nothing ?