SJ Alternator Fitting

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Re: SJ Alternator Fitting

Postby Andy_J » Sat 10.08.2019, 20:54

Finally finished putting the alternator in the car and got is started. The SJ alternator does just fit and does seem to charge properly. Had to get a longer belt to get over the larger pulley, 4PK698 belt did the job.
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Re: SJ Alternator Fitting

Postby KenS » Mon 12.08.2019, 20:28

Hi Andy, good to hear you were successful in fitting the SJ alternator - I have ordered a longer belt, preparing to follow your lead!
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Re: SJ Alternator Fitting

Postby HJ2 » Tue 13.08.2019, 08:41

Larger pulley... so less rpm? Is the output enough to keep things charged, even with all electric power users on?
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Re: SJ Alternator Fitting

Postby John_W » Tue 13.08.2019, 10:35

Just go faster.
:-D
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Re: SJ Alternator Fitting

Postby HJ2 » Tue 13.08.2019, 14:20

rev faster you mean :-D :-D :-D
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Re: SJ Alternator Fitting

Postby Andy_J » Tue 13.08.2019, 21:03

HJ2 - seems to put out enough volts at idle with no load. Will check with load at the weekend.

Not much load on the elan's electrics, no heated seats, no heated front/rear windows, no electric seats, etc

KenS - it is a very tight fit, you need to undo the intermediate bearing to drop the drive shaft or remove the drive shaft. As the alternator pulley has an extra groove the belt goes on the inner grooves.
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Re: SJ Alternator Fitting

Postby roy666 » Mon 14.10.2019, 22:37

Hi Guys - I finally got the SJ alternator off (it was only giving me 13.1 V with the battery charge light remaining on all the time) and put the original alternator back on, which I had completely overhauled/refurbished. All has been going well until today: as soon as I turn on any electrics on.. like lights/wipers/heater fan (even a light turn indicator).. the engine warning light blinks on and the engine stutters. The fault is intermittent: I can drive to work and nothing happens, then drive back at the end of the day and I hardly get home because of the stuttering. When the electrical load problem is happening the voltmeter is off the scale and jammed up against the stops! Any advice very welcome. cheers Mike
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Re: SJ Alternator Fitting

Postby HJ2 » Tue 15.10.2019, 10:27

Ouch! Was the alternator tested on a test bench before it was swapped?
My first thoughts are that the alternator is broken, or not connected properly.
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Re: SJ Alternator Fitting

Postby John_W » Tue 15.10.2019, 10:42

I’m surprised that a faulty alternator is causing a misfire; if the battery is healthy the engine shouldn’t care where it’s getting its electricity from battery or alternator.

I would be checking connections: earths certainly, but my first check would be the big thick positive power wires, because if one of them is coming adrift you do not want it to make contact with anything negatively charged. :shock:
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Re: SJ Alternator Fitting

Postby HJ2 » Tue 15.10.2019, 10:45

That's a scary thought indeed :smt073
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Re: SJ Alternator Fitting

Postby Andy_J » Tue 15.10.2019, 20:11

I agree with John an over charging alternator will probably not cause the problems you are having, I have driven an elan with an alternator charging at 17 volts and it ran perfectly, except for the battery that got scarily hot.

Sounds very much like a poor connection. I would expect it is either the main live cable on the alternator, this is a pig to tighten properly or a loose earth lead
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Re: SJ Alternator Fitting

Postby Simon_P » Tue 15.10.2019, 21:38

Is the Alternator plug pushed fully home?
As mentioned above it sounds like a dodgy connection.
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Re: SJ Alternator Fitting

Postby roy666 » Thu 17.10.2019, 21:31

Chaps - got the car up on a ramp and checked all the leads and mountings.. all good, nothing loose; however, now the problem seems to have gone away. Yesterday there was no issue.. nothing caused the engine warning light to come on(and I used indicators, fan, wipers, side ights). Then with all electrical bits off, I put on main headlights and main beam.. warning light came on and the car died on me!; fortunately, I had a slip road to coast off the A1 on. 5 minutes later the car started and I got to work without using the lights. Today: I put every bit of electrics on all at the same time... no issues whatsoever. Voltmeter slips down to just above 12.5 and everything runs smoothly. Now I can't replicate the fault at all. Wonder what tomorrow will bring! cheers M
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