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Arghhhhhh Alternator help now please (V8)


Hybrid_From_Hell
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Righty Ho,

When I built the Eales engine up we used the entire front end from a Std 1986 C Plate V8 90.

Which means I have the stunning 45 amp alternator - RTC5683 or Lucar*se No 24198

2 slight problems.

1 Each of the 2 new engine fans pulls around 20 amp EACH when running

2 I note in the parts book the V8 90 had a bigger alternator - RTC5087 or RTC5681 at 65amp (can't work out why 2 different ones ???) , is this a simple swap fit, or is the spacing plug other things make it an upgrade and with extar work and if so what ?

3 COS .... My current alternator seems poorly :angry: and doesn't charge up the alternator test lamp I have ..........even at higher RPMs....

Currently alternator sits Driver side front of engine....

So,

What are my options ? :huh:

1 Can I fit a bigger alternator as a "In and Out" type job ??, using the existing rectangular plug ??, and will the std 45 amp wiring take it (65 amps) ??

2 If not then what are the options ?.....

I know JW mentioned a Mondeo alternator 90amp ?,

obviously this will need bigger wires than I have now ?

A pic and words as to options would be good.???

Nige :(

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2 I note in the parts book the V8 90 had a bigger alternator - RTC5087 or RTC5681 at 65amp (can't work out why 2 different ones ???)

Because in poor weather conditions you need extra power for the headlights, wipers, heater and de-mister being on and still need reserve power to crank the engine after every other puddle. :D:ph34r:

Chris

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best swap the square plug as the spade connector won't be up the much larger Amperage, hence the lug type connectors used on larger output alternators.

What Tony said

And the wiring can get a bit warm too :)

If you have to mess about with it why not go the whole hog and fit a 100 amp jobbie

Endless post-puddle-cranking power available :D

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Righty Hoo Electric boys and girl Gurus....

Have had a rummage in the shed (Its legal yer know :P ) and have found the big thick wire that I had on the Hybrid engine which went from the alternator (ring terminal) to the Starter( another ring terminal)

This was on a 3.9 V8i, out of a RR classic about 1992 ish, and look as I might on Microcat I can't dind the part number or spec.

The wire is (inc the rubber coating) 7.5mm, and where I can just about get the vernier in about 5.5mm without the plastic sheilding.....what does the panel think this will handle amp wise if I go an upgrade ?

Any ideas of this part number too ?

Am I also right in thinking that I junk the 2 wires into the alternator block and replace with this one and the single small wire goes to the sensing terminal on the back of the alternator

Reasion for asking is I seem to have found in my shed a 120 amp bosch unit ????

Hmmmmmmmmmm :) ??

Nige

post-22-1161968554_thumb.jpg

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Nige,

Any way of measuring the conductor size?

Sounds not quite ideal for 120A, I used 10mm on my Mondeo one and have successfully jump-started off the alt post (it's more accessible 'cos the battery was under the seat) without problems :D

If you need some 10mm just shout, I have a bit kicking around ;)

EDIT: I meant 10mm dia, which according to VWP will be about 25mmsq / 170A B)

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Yes, chuck that POS in the picture in the nearest bin…………… :D

Make up a new lead using 180 amp battery cable and use an alternator that has a post for a ring terminal (most do)

At your local scrappy …………… Mondaneo 90 amp …….. VW golf GTI 120amp……… Sierra 90 amp …………all these will fit on the drivers side ………. Usually 15 notes apiece. Dont worry about pullety size or style ........ its all interchangeable ;)

Mine is passenger side ………….. I used an Escort 90amp ………..

Ian

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Actually i was going to post a similar question.

Which 100A ish altenators will mechanically drop onto the V8?

(doesnt need to be LR OE, i have scrappy close by)

edit - thanks BBC - you posted while i was typing

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Don't know if it's much help Nige, but I have a Mondeo with air-con etc. Wiring from the alternator is very basic, but the wire is the same diameter as the main battery cable. In fact the wire goes from the positive terminal of the battery to the starter motor, then continues on to the alternator. The wire must be 10 or maybe 12mm dia. Could you perhaps fit your 120 amp alternator and alter the wiring?

Les.

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Hmmmmm

Ta all keep the thoughts coming

Having had a further rummage I found 3 more alternators, one is a 90amp Lucas something or other, and then I dropped the torch and the bulb broke, its dark, and I fell over one of the other 2 alternators, grabbed something on the bench to steady myself, and that landed on the floor too, with a huge bang,

I decided that with flip flops on I was doing ok to escape right now, ....and will have a further lookie tommorrow :lol:

Nige :huh:

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:huh: [

What are my options ? :huh:

Just fit a 200amp premier power welder alternator :D charges 130 amps at 1900rpm can be to your door in 3 days :D

3 5hp bowmotors -8 roof lights ,2 x 50 amp fans , 2 x 20amp fans & still the volt meter sat at 13V at 2500 rpm

Gives me a hard on every time :huh:

Didnt go flat in Argyll like some :P:P

OH YER **** I like pink **** ****

Edited by Les

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Anyway, Nigel, I bought a brand new viscous fan on the last Old Sodbury recently which I thought is from a TDI, but....Its from a V8! So here we go, if you want a brandspanking new viscous fan for a v8; 20 pounds for you and it solves your problems.

Daan

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this will probably make the sensible people here shudder but i'd suspect your wiring would take a 100amp alt ok. im running a 130amp alt on my tdi (original is 65amp) with no changes to the wiring & it hasnt caught light after two years.

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Righty Hoo Electric boys and girl Gurus....

Have had a rummage in the shed (Its legal yer know :P ) and have found the big thick wire that I had on the Hybrid engine which went from the alternator (ring terminal) to the Starter( another ring terminal)

This was on a 3.9 V8i, out of a RR classic about 1992 ish, and look as I might on Microcat I can't dind the part number or spec.

1992 would probably have had a 100Amp alternator wouldn't it? My '93 does, but it's got all the electrical toys too.

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Bathtub, you want a nice 90 Amp 24V military spec alternator. That pushes out 90A at tickover and is hugely tough. The cost £55 for a brand new, possibly newley rebuilt, one at one of the shows over the summer :D

Nige, FYI the standard 65 A should be OK as you've not got a winch. My 65 one on the Tdi lasted for quite a while and didn't give major problems. The 85A one on the tgv has been fine so far.

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