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Registered
Join Date: Dec 2005
Location: lexington,ky
Posts: 81
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928 alternator regulator
is it possible to replace a 86 us model 928 regulator, or do I need to replace the entire alternator. my voltage seems to be fluctuating quite a bit.
when i change electrical load like turning on a light or turn signal, my voltmeter will momentarily drop about 3 volts. this has been happening for a little while, but seems to be getting worse. last night while idling my voltage momentarily dropped enough that the headlamps dimmed substantially, the engine quit and presets on my stereo got dropped. this happend twice last night. the engine started right back up with the twist of the key. the clock in the car kept it's preset time. Do you guys think i have a alternator/ regulator problem or is it something else? my car has been kept garaged in the desert most of it's life so all of my electtrical equipment looks new. I am living up in chicago now so maybe this humidity is messing with my car. I did start checking/ cleaning all my ground connections last night. didn't get to them all yet but so far they were ok. I did check the battery terminals. I still need to check my engine ground strap. tonight i am going to jack the car up and also check the electrical connections on the starter and alternator. I would think that even if the alternator completely died, the car should keep running for about an hour just on battery power alone, which leads me to believe my problem is not the alt or regulator, but maybe something else. I could have a loose connection, or i coud have a short somewhere that is drawing enough amps to cause the engine to die. I would think if i had a short somewhere that i would have some blown fuses though. |
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08-10-2007, 04:56 AM
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Network Native
Join Date: Jan 2007
Location: SoCal
Posts: 10,349
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I like Eagle Auto Electric, almost 3000 feedback on ebay with 100% positive.
They sell a rebuilt for 85+ 928 for about $120 shipped.
__________________
US 83 zinc metallic 5 spd, aka the nice car. Euro 85 black, 5 spd, the fast rough track car maybe car. SOLD Euro 84 red, AT, only car in garage in years, my parts car, soon to go last 7 years. |
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08-10-2007, 10:50 AM
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Location: lexington,ky
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I haven't been back to work on my car yet this week. so it goes as a corporate jet pilot ,but I am flying to California for the first part of the pebble beach concours this week
 Anyway I think I'm going pull the alternator off and have it tested when I get back. while I've got it off, I will check and clean all the connections on the alternator and starter. by the way are there any Porsche guys in the Chicago area? I am in the process of moving our jet there. |
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08-14-2007, 09:08 AM
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Network Native
Join Date: Jan 2007
Location: SoCal
Posts: 10,349
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928 sure does attract a LOT of pilots.
For a geographical list of 928 people try http://www.frappr.com/porsche928ers/map
__________________
US 83 zinc metallic 5 spd, aka the nice car. Euro 85 black, 5 spd, the fast rough track car maybe car. SOLD Euro 84 red, AT, only car in garage in years, my parts car, soon to go last 7 years. |
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08-14-2007, 12:02 PM
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Location: lexington,ky
Posts: 81
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I finally got back home (had to go to pebble beach to check out the cars- too bad I couldn't stay for the weekend)
Anyway I jacked my car up and did some work. First I cleaned and tightened the ground connection on the engine block. I cleaned the connections from the battery to the starter. then I removed the alternator and installed a new $22 voltage regulator in my old alternator. (this part is shared with most audi and bmw cars from the mid 80's so it was cheap) It was fairly easy to replace. Well now my voltmeter on my dash is rock solid, where before it danced all around with any change in load such as turning on a turn signal. hopefully my electrical problem is cured...... now must figure out why my timing belt tracking is off. I'm going to tear it down this week to find out. BTW i stopped by moto sport in salt lake city the other day. I have never seen so much 928 stuff in one spot. mike |
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08-18-2007, 08:46 PM
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Join Date: Dec 2005
Location: lexington,ky
Posts: 81
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I took some stuff apart on my 928 the other day. I locked the crankshaft in place and dropped the timing belt off. the belt looks perfect, I checked every roller and idler, they were fine. The tensioner is full of oil and moves freely. I did check the tensioner pivot or "shoulder bolt" and it is perfectly straight. I lubed the bolt and put it all back together. I torqued the shoulder bolt to 15 ft lbs with a torque wrench borrowed from a aircraft mechanic (their wrenches have to be tested and certified regularly)
Anyway no more tracking problems and no more slight squeak while warming up. |
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08-25-2007, 08:24 AM
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hay i just buy a 928 and have the same problem. i just want to know if the alternator is still charging good. Sandro from Aruba. thanks
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09-12-2007, 01:16 PM
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Location: lexington,ky
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it worked ok for a while, then the voltage started freaking out. the faster the engine went, the higher the voltage got. I couldn't live with that, so I got a rebuilt alternator.
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09-13-2007, 06:03 PM
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thanks for the info, but is it charging now 14 volt when it is idleling with the headlamps on and in drive position? or +- 12.6 v , and when jou drive it will go upto 14 v.
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09-14-2007, 06:37 AM
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Join Date: Jan 2007
Location: SoCal
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If you aren't sure, don't guess. Have the alternator tested, or just buy a good rebuilt. Too high of a voltage could damage many very expensive boxes inside your car.
__________________
US 83 zinc metallic 5 spd, aka the nice car. Euro 85 black, 5 spd, the fast rough track car maybe car. SOLD Euro 84 red, AT, only car in garage in years, my parts car, soon to go last 7 years. |
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09-14-2007, 07:57 AM
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Location: lexington,ky
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I'm not guessing. the voltage was steady at 14 volts with the car running after installing the new regulator. - not just on the dash meter, but verified with a fluke 87 voltmeter. It worked ok for about 2 days, then the voltage started going up. the more you revved the engine, the more the volts went up- to about 16 volts. the voltage would suddenly drop back to 14 volts. I could not live with this overcharging situation. I didn't want to fry a computer or overcharge my battery.
I was at a local junk yard and found a porsche that was wrecked but the alternator was still intact. Cost $14. works perfect. |
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09-14-2007, 08:23 AM
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Sorry, that was intended for Sandro. Seems like he wasn't sure of what the alternator was doing.
__________________
US 83 zinc metallic 5 spd, aka the nice car. Euro 85 black, 5 spd, the fast rough track car maybe car. SOLD Euro 84 red, AT, only car in garage in years, my parts car, soon to go last 7 years. |
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09-14-2007, 09:09 AM
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09-14-2007, 11:03 AM
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Sandro that sounds normal, don't worry. The 928 has large battery, and when rpm is higher charging is fairly rapid.
__________________
US 83 zinc metallic 5 spd, aka the nice car. Euro 85 black, 5 spd, the fast rough track car maybe car. SOLD Euro 84 red, AT, only car in garage in years, my parts car, soon to go last 7 years. |
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09-14-2007, 11:20 PM
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09-15-2007, 05:30 AM
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