Limp mode or battery voltage problems

[Hunter99]

Hey guys I have a 2007 ford xr6  6 speed auto its recently starting to give me grief I drive it for a little bit everything seems ok then boom it goes into like limp mode or some sh*t "D" starts flashing on dash flick it over to tiptronic wont go out of 3rd gear traction,abs,battery light all comes up on dash then it just putts out. So I get my mate to give me a jump start everything starts working again but only for a short while then it starts doing the same sh*t I just described again. 

 

So far ive brought a battery(new) and alternator(second hand) but it still keeps happening any ideas is this transmissions related or voltage problem? 

[k31th]

that's a tricky one... battery being new and still causing it is definitely a weird behaviour... hopefully somebody else can help you more than I just did

[Hunter99]

Yeah bro first time it started doing this to me I replaced alternator and battery then everything went back to normal I drove from rotorua to tauranga yesterday then it started doing these issues again idk what to do

[k31th]

hmm, get the charging system diagnosed to see if your second-hand alternator is actually working properly... as it might not be and it may have cooked your battery.

[Hunter99]

Does anyone know if 13.29v at idle is a good thing or is my alternator stuffed

[k31th]

that's pretty good. what does it drop to when you turn the engine off?

[Hunter99]

Its at 12.50v when engines off ive pulled alternator out of my other one today and switched them over 

[k31th]

well, it sounds like the charging system is working, but to be sure I'd get it tested. The voltage is a good indicator, but not perfect.

[Hunter99]

Sweet bro is that like getting it scanned at shop or something? Thanks for your help appreciate it man!

[k31th]

auto-elecs have the ability/equipment to do a battery and charging system test.