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20-03-18, 08:03 AM | #11 | ||
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Location: Plympton, Plymouth
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When doing the last test the VDO read about 11.5v and the meter was 15.2v - I know when the battery light goes out the VDO normally goes up to about 13v
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Audi = Acceleration Under Demonic Infulence Current Car - Audi Coupe GT 5S 1982 Model Mark 1 Been in the family now for 30+ years. Restoration Thread Also Weekend Cars - Audi A4 Touring Car, Audi A4 DTM |
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21-03-18, 04:13 PM | #12 |
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Here is the back of the dash:-
I have done a continuity test between the end of the lead that connects to D+ on the alternator and the end that connects to the dash to light the battery light - all good. Done a continuity test between lead and -VE on battery with neither end connected and from both ends reads that is connected to -ve no resistance. Same and to +ve and depending which way meter is connected either 456 or 1156 and climbing. Pulled out the electronic relay that is top right in the dash and the oil warning light want out but the battery light stayed on. So, tell me if I am wrong, there seems to be a problem in the fuse box. If so what could the problem be? This is really starting to stress me now.
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Audi = Acceleration Under Demonic Infulence Current Car - Audi Coupe GT 5S 1982 Model Mark 1 Been in the family now for 30+ years. Restoration Thread Also Weekend Cars - Audi A4 Touring Car, Audi A4 DTM Last edited by krzracingcouk; 21-03-18 at 04:16 PM. |
21-03-18, 07:01 PM | #13 |
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There's no problem in fuse box, as the only possible problem would be blown instrument cluster supply fuse, in which case everything electric apart from clock would be dead in cluster.
I asked you to remove oil pressure control relay and drive the car - obviously with engine not running that relay cannot affect alternator light in any way, as it's connected to exciter wire solely for it's own needs to help it determine if the engine is turning or not. |
21-03-18, 08:03 PM | #14 |
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I will try and find that one, I thought is was one of the 2 on the back of the dash but one is the gear up relay(171 919 091a) and the other (not sure if this is the one you mean) turn the flashing oil warning light off (433 953 213b). Pulled both those and revved the engine hard (upto 5k plus) and not difference to the battery light going out.
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Audi = Acceleration Under Demonic Infulence Current Car - Audi Coupe GT 5S 1982 Model Mark 1 Been in the family now for 30+ years. Restoration Thread Also Weekend Cars - Audi A4 Touring Car, Audi A4 DTM |
21-03-18, 08:14 PM | #15 |
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Is the car a daily driver?....if yes just start the engine and earth a bulb to the IND terminal on the alternator and it will start charging the battery.........means you can use the car?
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23-03-18, 07:58 AM | #16 |
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I use it regularly but not daily, when you say IND terminal I assume that is the D+ terminal. At least I will feel more comfortable using the car knowing it is charging while I am sorting problem correctly.
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Audi = Acceleration Under Demonic Infulence Current Car - Audi Coupe GT 5S 1982 Model Mark 1 Been in the family now for 30+ years. Restoration Thread Also Weekend Cars - Audi A4 Touring Car, Audi A4 DTM |
23-03-18, 10:55 AM | #17 |
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Well, I have no idea how you have figured that out, but that's not gonna work. For alternator to start to work upon starting to turn, voltage regulator must be provided with positive voltage on exciter wire - that could be achieved by connecting exciter terminal and alternator output terminal, but that would end up in draining the battery when engine is off.
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23-03-18, 02:55 PM | #18 | |
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Audi = Acceleration Under Demonic Infulence Current Car - Audi Coupe GT 5S 1982 Model Mark 1 Been in the family now for 30+ years. Restoration Thread Also Weekend Cars - Audi A4 Touring Car, Audi A4 DTM |
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23-03-18, 03:48 PM | #19 |
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Temporary solution is not touching anything and revving engine high enough so that alternator would self-excite, after starting the engine. I once had to do that - I was piloting my neighbours T4 2.4D with wire between alternator and indicator light broken - after we found out that the battery is flat and we had to push start the car, I figured out what is wrong, so for the rest of the ride after engine being stopped and restarted, I started with harder acceleration in first gear.
If your alternator doesn't respond instantly when not charging and engine being revved to 4-5k - I would suggest to inspect the alternator... |
23-03-18, 06:44 PM | #20 |
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All I would do is earth the side-light bulb(side that's closest to alternator) via the IND/D+ terminal on the alternator.
Start the engine, switch the lights on and this will do the job of the dash bulb. After you've done this the alternator will be charging......you can turn the lights off again but beware if you actually need to use the lights then the sidelight won't work! Simples ! |
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