esc rst - alternator prob - help!! :(

cosworth_wannabee · 28-11-2009, 01:34 PM

hi all, i have just got a new alternator off the net as my old 1 was giving up on me. Its shaped exactly the same so it will fit, the only thing is the electrical side of things is a bit different. ive put a pic of the 2 below to show what i mean. the original i just took off just had 2 wires on the alternator. the new 1 has 2 parts where wires are too be fitted too, as shown in the pic circled in green, but i am worried about the spade connections found which i have circled in red, am i missing something or are these nothing to worry about and should i wire it up as the old 1 was?!?!

the old alternator says b+ and d+ for the wires and the new 1 says W and B.

any help on wiring this would be great cheers.

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iansoutham · 28-11-2009, 02:08 PM

I assume that your RS has a heated windscreen as the old alternator is a 70A one.

The two spade terminals on the alternator on the right are generally only used with 55A or lower alternators. The other connections are probably for different types of car with bolt-on terminals as standard.

The W output is a single-phase output normally used for things like Diesel revcounters.

The D+ output would be the blue wire for the battery light on the dash
The B+ output would be the big red wire from the battery/starter motor.

I would say you have a 55A alternator supplied, not a 70A one. Check the label on the side of the alternator to confirm.

cosworth_wannabee · 28-11-2009, 02:19 PM

hi, its a 75 amp alternator, well so the seller tells me.
so shall i just wire it up as it has been already and not worry about the spade connections?? cheers

mk4gartrac · 28-11-2009, 02:42 PM

I was running a big ice system on an old mk4 rst and killed the alternator so was advised to put a 90amp one from a granada v6 with full electric pack the only differance is the puly is a bit bigger but it went straight on and never had problem again

iansoutham · 28-11-2009, 02:42 PM

Quote:

Originally Posted by cosworth_wannabee

hi, its a 75 amp alternator, well so the seller tells me.
so shall i just wire it up as it has been already and not worry about the spade connections?? cheers

As long as you wire it up as above, i.e. B+ to battery, D+ to blue wire and leave the W alone, it should work fine.

Once running, I would get the available output checked though as I am still suspicious.

cosworth_wannabee · 28-11-2009, 03:43 PM

ok kool, but on the new 1 there is no d+ only b+ and a w, so should i put the d+ to the w???

tabetha · 28-11-2009, 05:53 PM

On the NEW alternator the smaller spade terminal, in the same slot as the two larger ones, is for the warning light, so this would be where the D+ needs to be wired to.
tabetha

cosworth_wannabee · 28-11-2009, 05:56 PM

ok thank you very much. so i havent got to worry about any of the other connections. jus the d+ to smaller spade and larger wire to b+. thanks all

tabetha · 29-11-2009, 01:07 PM

Yes, that's all you need, as you've said.
tabetha

JesseT · 29-11-2009, 06:37 PM

Yes, teh two larger spade connector are both B+ and should both be connected as one cannot carry the amperes alone.

28-11-2009, 02:08 PM	#2
iansoutham OCD Victim Garage is empty, add now Trader Score: (0) Join Date: Sep 2005 Posts: 1,687 Rep Power: 8	I assume that your RS has a heated windscreen as the old alternator is a 70A one. The two spade terminals on the alternator on the right are generally only used with 55A or lower alternators. The other connections are probably for different types of car with bolt-on terminals as standard. The W output is a single-phase output normally used for things like Diesel revcounters. The D+ output would be the blue wire for the battery light on the dash The B+ output would be the big red wire from the battery/starter motor. I would say you have a 55A alternator supplied, not a 70A one. Check the label on the side of the alternator to confirm. __________________ "What is your major malfunction soldier?" Hi. This is the qmail-send program at kermit.axnoc.net. I'm afraid I wasn't able to deliver your message to the following addresses. This is a permanent error; I've given up. Sorry it didn't work out.

29-11-2009, 06:37 PM	#10
JesseT PassionFord Post Troll Garage is empty, add now Trader Score: (0) Join Date: Jun 2003 Location: Finland Posts: 2,859 Rep Power: 11	Yes, teh two larger spade connector are both B+ and should both be connected as one cannot carry the amperes alone. __________________ Orion tic & Escort tic & 2xFocus

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28-11-2009, 02:19 PM	#3
cosworth_wannabee Part of the Furniture Garage is empty, add now Trader Score: (0) Join Date: Dec 2006 Location: Birmingham Posts: 162 Rep Power: 6	hi, its a 75 amp alternator, well so the seller tells me. so shall i just wire it up as it has been already and not worry about the spade connections?? cheers

28-11-2009, 02:42 PM	#4
mk4gartrac I'm Finding My Feet Here Now Garage is empty, add now Trader Score: (0) Join Date: Jul 2006 Location: beds Posts: 127 Rep Power: 6	I was running a big ice system on an old mk4 rst and killed the alternator so was advised to put a 90amp one from a granada v6 with full electric pack the only differance is the puly is a bit bigger but it went straight on and never had problem again

28-11-2009, 03:43 PM	#6
cosworth_wannabee Part of the Furniture Garage is empty, add now Trader Score: (0) Join Date: Dec 2006 Location: Birmingham Posts: 162 Rep Power: 6	ok kool, but on the new 1 there is no d+ only b+ and a w, so should i put the d+ to the w???

28-11-2009, 05:53 PM	#7
tabetha BANNED BANNED Garage is empty, add now Trader Score: (0) Join Date: Jul 2006 Location: uk Posts: 24,646 Rep Power: 0	On the NEW alternator the smaller spade terminal, in the same slot as the two larger ones, is for the warning light, so this would be where the D+ needs to be wired to. tabetha

28-11-2009, 05:56 PM	#8
cosworth_wannabee Part of the Furniture Garage is empty, add now Trader Score: (0) Join Date: Dec 2006 Location: Birmingham Posts: 162 Rep Power: 6	ok thank you very much. so i havent got to worry about any of the other connections. jus the d+ to smaller spade and larger wire to b+. thanks all

29-11-2009, 01:07 PM	#9
tabetha BANNED BANNED Garage is empty, add now Trader Score: (0) Join Date: Jul 2006 Location: uk Posts: 24,646 Rep Power: 0	Yes, that's all you need, as you've said. tabetha

29-11-2009, 06:37 PM
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