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Electronic dizzy coil issue
No life (a.k.a. DattoMaster)
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2002/3/7 9:55
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Hi all I'm stumped on this issue I'm facing
Converted a b310 to L series that was running fine with electronic distributior

Wired it all up and was running ok tunning it the other day. Now won't start.

Checked plugs damp with fuel.
Check the coil 12v at + and earth to chassis with the key on. Try - pole on diszzy 0 volts?
Key off get 12v with post on battery neg on - on coil.

The only wire to neg on coil is white wire as per sunny diagram. It goes to tacho on dash and dizzy.
If I disconnect this wire with key on I get 6v from dash 0 from coil. If I disconnect withe wire from coil and dash I with a + 12v I get 12v showing the wire is not broken from harness to the coil.

There is no ballast resistor as the alternator is internally regulated too.

It's got me stumped as was running other day.

Posted on: 10/6 16:13
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Was B110 Sedan: L series
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Re: Electronic dizzy coil issue
No life (a.k.a. DattoMaster)
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Is it just a matter of running a ground directly to the neg terminal of the coil possibly

Posted on: 10/6 16:17
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Re: Electronic dizzy coil issue
No life (a.k.a. DattoMaster)
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2002/7/19 12:41
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Is it possible the coil has failed. On My Sunny I have two wires to the positive side of the coil & one to the negative. One of the wires to the positive side is from the resistor that I have deleted, so it's not necessary, but I've hooked them up to neaten the appearance. Isn't there a pair of wires going to the distributor, could one of these be broken. Has the distributor got an earth connection. My old Navara stopped dead on me one day when the earth wire came off.

Posted on: 10/7 3:27
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Re: Electronic dizzy coil issue
No life (a.k.a. DattoMaster)
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Blue bird dizzy has only 2 wires a pink and green to the coil. No earth from coil to dizzy.
I thought of adding another earth from dizzy base to coil.
Strangely if I disconnect the white wire from coil (the one that goes to tacho)
I get 6.4v if I earth from that to post on the coil.

I took the dash out and if I check voltage there it's 6v out of the tacho. Is that right.

Tried a spare coil too. Same results.
I'm thinking it's an earth issue now. Just can't work out where the issue lies and if would cause an issue adding another earth to coil - post

Posted on: 10/7 3:54
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Re: Electronic dizzy coil issue
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Coil - must never be wired directly to ground/earth. The earth is switched by the distributor points or the electronic module

This is also why the coil may not show a voltage when the engine is not running. The way to check for voltage feed is Voltmeter from Coil + to Battery -

btw, Ballast Resistor has nothing to do with Alternator. Ballast Resistor use depends on the coil (some coils require a resistor, others are designed to be used without a resistor)

Posted on: 10/7 4:48
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Re: Electronic dizzy coil issue
No life (a.k.a. DattoMaster)
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Ok that would make sense. Thanks dd.
So with key to on it may say 0. Might rotate engine by hand to see if dizzy triggers 12v.

When I put + on coil and neg probe on neg battery I get 12v. Thanks

Posted on: 10/7 7:31
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Re: Electronic dizzy coil issue
No life (a.k.a. DattoMaster)
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Would the tacho wire from dash read less than 12 v?

Posted on: 10/7 7:32
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Re: Electronic dizzy coil issue
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With points, rotating the engine will change the voltage as the coil is switched on/off. But with electronic ignition, it depends on how the unit works. The factory service manual for it will provide test procedures, example it's the Bosch/Bluebird EI unit


Quote:
Would the tacho wire from dash read less than 12 v?

1. Tacho wire disconnected from coil will read one thing
2. Tacho wire connected to coil will read the same as the coil terminal, which is various depending on how the module works. With engine off, perhaps Ground (briefly) followed by 12V via the coil winding (which will not repeat). With engine cranking, something like 9V average as it switches on/off

Posted on: 10/7 9:17
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Re: Electronic dizzy coil issue
No life (a.k.a. DattoMaster)
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Varies between 7.2 and 9.1v by my voltmeter

Anyhow got it running again thanks dd.
Unplugged and repluged couple of connection and it fired up with a bit of start ya bastard.

Posted on: 10/7 10:16
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