Quick Check On Coil Wiring

[Dave Bell]

Well... I still haven't hooked up the new Crane Hi-6 Ignition yet. I had hoped to get my spare Air Flow Meter in first and play around with that... still waiting for it to arrive.

In the mean time I have prepped the area for the install, cut out some of the firewall sound proofing, secured the rest of the sound proofing to the fire wall with screws and washers since a couple of the clips are now non-functional, cleaned and painted the exposed firewall... (O.K. so I didn't clean it so well... but I did paint over it so I don't see all of the old rubber cement that appears behind the sound-proofing), drilled mounting holes for the Crane Ignition and Coil units, prepped some of the wires and connectors and cut and installed the new MSD spark cables.

Now for the question. I was looking at the connections to the current coil and I see on the positive side, 2 wires coming into one connector. One wire must come from the Starting switch, 12V of power, and the other from the Fuel Injection Brain???? On the Negative side of the Coil I find the points wire, the Tach wire and a third wire which maybe also goes to the Fuel Injection Brain???

First have I got it right about the mystery on wires on either side of the coil connecting to the fuel injection brain or do they go somewhere else?

In either case, I know the Tach wire now goes to the Crane Tach output (With tach adaptor transformer), but will the mystery wires still attach to the new coil in the respective positive and negative positions? Really don't want to blow up my FI brain by making a mistake here.

Thanks for the input guys.

- Dave

[John Rogers]

What are the colors? The input or +12v side is used a lot to tap for switched +12v in the engine compt. But to be sure you need to find the colors.

[JP Noonan]

I had the HI-6 in my car without any tach adaptor. Although my HI-6 is an old "gold" kind, I don't think the new ones are different.

The L-Jet does get it's crank position signal from the coil. Best bet is to look at the wiring diagrams elsewhere on this site.

Black/Purple is the tach, Green is usally the condensor/points, should be on neg side. The Blk/red is from the ignition and on the pos side. This is on a D-Jet though, and off the top of my head (which is losing hair faster than a 914 rusts BTW).

I'll try to dig up some diagrams if you have any trouble figuring them out. Beleive me, there is no shame in not being able to read those freaky diagrams. Took me awhile, the one thing that helps it to think of the electricity flowing like water from the top of the page to the bottom.

[Dave Bell]

Yea the wiring diagrams are pretty "interesting" reading...

Well here is what I have:

On the + side of the coil, one Black wire runs to the relay pair underneath the Battery.... probably the switched +12V. The other Black wire teams up with the Black/Purple Tach wire and disappears into a plastic sleeve with the green/red wire from the oil temp sensor and a white wire that is just clipped and hanging out.

On the - side of the coil, is the Black/Purple Tach wire mentioned above, the green wire from the condensor and a white wire that disappears into a plastic sleeve with lots of other wires, including the FI harness, underneath the battery.

Looking on my Haynes Wiring diagram, figures 9.91 and 9.89.... (Boy this is interesting reading isn't it....) It shows one black wire running from the double relay to the + side of the coil (Terminal N15, figure 9.89).... But no second black wire... connected to the coil directly...


Haynes show the green wire from the condensor/points and black/purple wire from the tach going to the - side of the coil, figure 9.89... and a black wire from the FI to the - side of the coil, figure 9.91.

O.K. So it seems safe to connect the black wires from the plus side to the Crane Ignition switch wire.

The green wire will go to the Crane points trigger wire

The Tach wire I will have to hook up to the Crane Tack ouput withh or without the tach adapter, etc.

And the Mystery white wire maybe is a hacked up connection to the FI? and it should logically go with the tach wire and connect to the Crane tach ouput or tach adapter?...

I am just rambling now as I look at the electrical diagram...hmmmm

Maybe it is time to call Crane now that I can trace the wires and know somewhat what to ask about.

Thanks guys...

[This message has been edited by Dave Bell (edited 05-18-2000).]

[surfcity914]

Dave, i haven't been able to get to looking at the car, but i don't recall extra wires when i installed the crane unit. just the wire to the positive, the negative, and to the tach. i'll try to look at it again this weekend.