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post #31 of 46 (permalink) Old 10-09-2010, 08:12 AM
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2nd relay to operate pumps:
That's kinda what papajam and ghnl are saying regarding the large tachymetric relay that controls the pumps.

In the tachy relay the 'normal use' set of contacts takes the pulse signal from the coil and using internal contacts that float like ignition points activates the pumps while the engine is running. As long as the engine is running the tach pluse is generated by the coil, so the pumps continue to function.

There is another service wire on the that same relay, though connected to a different terminal than the coil pulse signal, so instead of relying on the coil pulse to trigger the internal points, there's more or less a direct steady state conventional relay activation trigger built into it also and that relay internal circut is activated by the ignition switch when turned to the start position.
No coil pulse, ignition switch in start position, pumps run.

Part of the reason there's way many more wires and terminals on that particular relay is that it does more than just one trick.
(also why it's like $100 to replace instead of $10~$12 like all the other relays)


Pure speculation mode:
Without hacking one open to confirm, at least in theory I'd even hazard that there'd be redundancy built into the tachy relay that allows the pulse signal from the coil to cycle the pumps in bursts as the engine is cranked and the ignition fires while trying to start.
Granted it wouldn't be as effective at getting the pressure up in a hurry like the start circut arrangement does, but it could certainly get it into an adiquate pressure range to in just a few pulses and should allow the pumps to operate while cranking if the ignition switch signal were faulty.




****
Voltmeter:
Yes, I meant in dash type instrument.




Darren
'84 manufacture ~ '85 MY Spider Graduate

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Last edited by Tifosi; 10-09-2010 at 08:33 AM.
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post #32 of 46 (permalink) Old 10-09-2010, 09:17 AM
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Originally Posted by trojwl View Post
I absolutely know my way around... electronics, relays, blah, blah,blah...
Then please expound on the Smoke Theory of automotive electronics.

- - Eric
don't read this
~ 1984 Spider Veloce ~
- -~ 1981 GTV-6 ~
Mebane, North Carolina


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post #33 of 46 (permalink) Old 10-09-2010, 09:40 AM Thread Starter
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I guess I haven't quite "seen it all".

As a point of interest I have a 1988 Honda CRX (with transplant Acura engine), 1982 Porsche 911SC, and the 86 Alfa. All are in super condition and I do 90% of work on them. There are certain three different sets of philosophies between the nationalities. I've only had the Alfa for nine months and it has been nothing short of interesting t-shooting issues.
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post #34 of 46 (permalink) Old 10-09-2010, 09:44 AM Thread Starter
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Smile Pics

My "children".
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post #35 of 46 (permalink) Old 10-09-2010, 10:00 AM Thread Starter
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In case I want to go very fast

2002 Yamaha VMax
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post #36 of 46 (permalink) Old 10-09-2010, 01:53 PM
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You need a bigger garage!
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- - Eric
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- -~ 1981 GTV-6 ~
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post #37 of 46 (permalink) Old 10-09-2010, 02:13 PM
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'bigger garage'...you suck!




Darren
'84 manufacture ~ '85 MY Spider Graduate

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post #38 of 46 (permalink) Old 10-09-2010, 02:47 PM Thread Starter
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Very cool...
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post #39 of 46 (permalink) Old 10-09-2010, 03:34 PM
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'bigger garage'...you suck!
And my wife says, 'you should have made it bigger'. (yes, she has sisters but they are nothing like her...)

- - Eric
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- -~ 1981 GTV-6 ~
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post #40 of 46 (permalink) Old 10-09-2010, 04:04 PM
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(yes, she has sisters but they are nothing like her...)
I know what you mean.
My wife's sister is fat too.




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'84 manufacture ~ '85 MY Spider Graduate

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post #41 of 46 (permalink) Old 10-09-2010, 07:24 PM
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My wife's sister is fat too.
No, not that. They're all good lookers but the attitude is different.

- - Eric
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~ 1984 Spider Veloce ~
- -~ 1981 GTV-6 ~
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post #42 of 46 (permalink) Old 04-22-2014, 02:20 PM
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does anyone have an owners manual for an early 1986 alfa 2000 spider veloce with cluster wiring diagram?

Last edited by dragn78; 04-22-2014 at 02:21 PM. Reason: letter missing
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post #43 of 46 (permalink) Old 04-22-2014, 03:01 PM
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does anyone have an owners manual for an early 1986 alfa 2000 spider veloce with cluster wiring diagram?
Contact BB member Papajam. He makes color coded wire diagrams for many Alfa models. He is also the librarian for the AROC-USA and can help you get owner's & shop manuals.

There is also Car Disc. But the Alfa wire diagrams are too cryptic to decipher. Get Papajam's versions.

- - Eric
don't read this
~ 1984 Spider Veloce ~
- -~ 1981 GTV-6 ~
Mebane, North Carolina


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post #44 of 46 (permalink) Old 04-23-2014, 07:42 PM
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Really great technical discussions by a bunch of true Alfisti (sic) but before you go off reinventing the wheel let me offer of a little common basics. In the space behind the passengers seat where all the Bosch goodies are, there is a small black relay and a gang of black ground wires attached to the sheet metal for a common ground. Disconnect all the ganged ground wires, wire brush the sheet metal at the bolt hole and steel wool the ground wire lugs. Then reconnect it all back with some dialectric grease and a shinny new bolt and elastistop nut. This stands a very good chance of resolving the issue. If not, try replacing that small black relay. I have had amazing good results from ensuring really good grounds in Alfas in the Bosch storage area and with the tail lights renewing the grounds in the trunk.

Robert
Currenlty 1988 Alfa red Quad
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post #45 of 46 (permalink) Old 07-31-2017, 09:19 AM
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Just traded a 73 Datsun 240z for a 1986 Alfa spider veloce. My wife's 40th anniversary present. We had one years ago and always missed it when we sold it. Anyway, trying to sort a few issues. I have no horn, windshield wiper motor is not functioning on car but test and works.
Do you have an electrical schematic to share?

I also seem to have an oil leak that is hitting the exhaust and of course making smoke and bad smell.

Thanks for your help!!

KWsAlfa
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