s2erst

Hi all im after a bit of help ive got a volts gauge fitted in my rs when sitting there with nothing on all is fine until i put something on like music, lights, fans, heater you get the idea then volts drop to 12v an revs drop off it has new battery an alternator so any other ideas cheers

rs2kbaby

check for a bad earth, does it go to stall when driving if you have lights,stereo,e.t.c ?

s2erst

[QUOTE=rs2kbaby;6154278]check for a bad earth, does it go to stall when driving if you have lights,stereo,e.t.c ?[/QUOTE


It does'nt stall but revs drop right down when i come to stop

rs2kbaby

umm does sound like an earthing prob, would check and clean earthing points first and go from there, could possibly be the wrong alternator and it isnt sticking enough charge out to keep battery topped up, check see what the ampage should be then look on the alternator to see what its rating is,

s2erst

another strange one is sometimes when i start my car i have to rev it above 3k before it will start charging the battery

cabriolet

curse of the blue wire? check battery voltage before starting and when idling [alternator should be 70 amp ]voltage should rise iffy alternator i think

rs2kbaby

sounds like a wanky alternator take it back, it has been known for new parts to be faulty especially recon units. possibly might be able to replace the brushes in the unit sounds like they aint making contact until you give it a blap of throttle or the regulator is duff in it, either way i think you have discovered your problem.

s2erst

dont think its alternator mate as it done it with old one and new one but blue wire could be worth a look

martysmartie

iTrader: (1)

You have a bad field circuit, does your battery light work?

Also you need a voltmeter to measure the power AT the battery, that volt gauge could well be dodgy OR people fit them in a totally inappropiate place, i.e. onto another circuit.

Martin

s2erst

i have voltmeter. yes i must admit it is earthed off the cd player but i know it doesnt charge sometimes till i rev it because my power steering dont kick in till its fully charging

martysmartie

iTrader: (1)

Like I say thats most likely the field circuit, does your battery light illuminate when the ignition is switched on?

Martin

s2erst

yes bud light comes on

martysmartie

iTrader: (1)

I would still check the blue wire on the unit itself personally.

Martin

s2erst

yes i will put it on ramp tomorrow at work an check it out cheers bud

lockie

dont supose u have a painted or powdercoated alternator bracket?????

when i rebuilt my series 1 i had chargeing issues & it was cos the alternator wouldnt earth to the block cos the bracket was powdercoated. (earth alternator to battery with a jump lead to test)

u checked its charging?????

s2erst

No not coated at all bud. It def charging

rs2kbaby

cant see it being the blue wire unless loose connection,