Joe,
I believe the 4 wires coming out are
1. Water temp sending unit.
2. To resistor block
3. Bypass resistor block on start.
4. Coil to distributor.
If you have power to the ignition switch then you should be able to test
as follows.
One wire should be hot anytime the ignition is on. This should be the
one to the resistor block.
One should be hot only when the ignition switch is moved to start. This
should be the resistor bypass straight to the coil.
If neither of these wires is connected to the resistor or coil then you
should be able to test for the water temp wire by grounding the other two
one at a time. If your temp gauge is working, when you ground its wire the
gauge should move.
By elimination the last one should go to the distributor.
Richard
----- Original Message -----
From: "Joe Rubio" <joe@venuesports.com>
To: <datsun-roadsters@autox.team.net>
Sent: Monday, October 07, 2002 6:03 PM
Subject: 1970 electrical help
> Folks,
>
> My buddy and I have hit our heads against a wall. We are trying to
> finish up my 1970 1600 with a 2000 engine. The problem is as follows,
> he nor I have a frame of reference for knowing how to hook up the coil,
> the alternator and the starter. This comes from the fact that the
> previous owner had a tractor engine in the car and redid all the wiring,
> so we have no idea what goes where because the car didn;t have anything
> but an empty engine compartment when we got it. Everything just is a
> mess and doesn't make any sense. Add to that the fact that different
> Datsuns Roadsters have different set-ups meaning we cannot look at
> photos on the net and get a clear idea of what goes where. We are
> stuck. We can probably redo the whole thing from the wiring diagram,
> but we like to avoid having to do that. What we ideally need is someone
> who knows the electrical set up on a 1970 1600/2000 SU car who can
> assist us. As I see it, the engine compartment has 3 basic harnesses,
> one for the lights, etc in the front of the engine compartment (we have
> a new one of those) and then 2 additional ones. Is there anyone in San
> Luis Obispo who knows 2000's well enough that can tell us exactly what
> goes where by taking a look at my screwed up electrical situation in
> person and advising us a course of action? If there is someone in the
> East Bay Area in Fremont, Walnut Creek, Danville or even San Jose who
> can help, that would be great too. My buddy is up there next week for
> business and can stop by to take some digital photos of your car and
> chat. See he's the brains of the opperation, but he's a muscle car/Saab
> guy, not really a Datsun Roadster guy so he's lost, which means I'm
> lost.
>
> I know I've made this request before, but we thought we could figure it
> out on our own. Turns out, we can't. The bummer is we have all the
> mechanical in, ready to go. New brakes, new rebuilt engine, rebuilt
> carbs, rebuilt starter, new batter tray, cables and battery. New
> clutch, cleaned out gas tank, new hoses throughout. New tires on the
> way, Miata seats getting ready to come in from Florida. The thing is
> ready to roll, but we need spark. Can anyone help us out?
>
> Let me know. Appreciate any input you guys can offer. We're going to
> get this damn thing to Solvang this year of it kills us. It looks like
> it just might.
>
> Joe
>
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