[Fireblade]

Hello - I have changed the alternator, be cause I had codes like p0340 and 0344 but now I have a P0622 code and the Battery lights in my display, hmm have done something wrong.

I also notice that when the motor is just running it sometimes go down to 500 rpm then gets back to 900-1000

 

[1RápidoZorro]

Sounds like its taking a load. Have you checked to see if any particular thing is kicking in right when they RPMs drop.

 

[07 Boss]

Well that means Generator field circut malfunction or something like that. And if you know the alternator is good then it is probably the wiring. Use voltmeter to test the wires to see if there is a drop off. Wiring can look good from the outside and still be shot on the inside.

 

[Fireblade]

yes the Alternator is new, but I have also tested the Battery when the engine was running and it was 14.49volt looks good, but still I see the battery in display/ code P0622 / the engine goes down to 500 rpm when running.

when I changed the alternator I noticed that on one of the cables, the one where there is robber over the connector, there is a hole in it about 1cm in diameter.

 

[Fireblade]

Sounds like its taking a load. Have you checked to see if any particular thing is kicking in right when they RPMs drop.

nah I dont think so, it always when the car stays with engine running, but it also first happen after alternator install

 

[silverstang]

FMC alternator??

 

[Fireblade]

Im not sure what a FMC alternator is, means FMC

 

[Mr.Stang08]

I just installed my PA Performance alternator and changed the wire to #4. Works like a charm. You should do the same.

 

[Fireblade]

I just installed my PA Performance alternator and changed the wire to #4. Works like a charm. You should do the same.

what do you mean "change the wire to 4"

 

[Mr.Stang08]

Gauge #4 it's a thicker wire for higher output alternators. It can take more amps than the stock wire.

 

[Fireblade]

ahh i get it, hmm well the new motorcraft is 130amp, im not sure what the stock was, I bet less.

 

[Fireblade]

just got a new Motorcraft alternator, i have now installed it and bing i get the p0622 code again. Another thing what kind of wire is that and where do i get it