Who has a Jacobs box hooked up?

[sc2dave]

I want to see where the wires go. I went with the Jeg's FC one and it hooked it up that way. I cranked it, nothing. I then disconnected the coil wire and put it close to ground for spark and when I touched the Red 12v switch wire multiple times to the battery, the coil sparked every time! I then connected it to see if it would start, nothing. The Red and Black wires came together in a plug end. Here are the instructions; http://www.jegs.com/InstallationInstruc ... 341000.pdf

[Tuner]

How are you triggering it, green wire to points or OE ignition amplifier, or orange and purple wires to magnetic pickup in your distributor? Where is the Jacobs connection to the car's ignition system, to the OE ignition amplifier wire that would originally go to coil negative, or to the distributor magnetic trigger? What kind of car is it?

[sc2dave]

orange and purple wires to magnetic pickup from dist. I'm trying to run it on my '87 toy truck, 22r carbed. when it was time to turn engine on, I held 12v red wire to battery, while someone cranked it. That's how I found out it sparked, when I had coil wire off and close to ground. How can i determine which side of the magnetic pickup is neg or pos?

[Tuner]

Is the original Toyota ignition amplifier in the distributor or on the fender?

[sc2dave]

under the coil on the fender.

[Tuner]

Does the original ignition work, make spark?

[sc2dave]

Yes, I drive it every day. til recently, I had a 6A connected to it.

[Tuner]

[Tuner]

The Jacobs orange + and purple - wires should connect to the distributor mag trigger wires the same as the MSD green - and purple +. Note the purple wires are opposite polarity, Jacobs purple is - and MSD purple is +, so you would not connect the purple Jacobs wire to the same distributor wire as the MSD purple did, but the opposite. Be sure the green wire is not hot or grounded, tape it off.

[sc2dave]

ok. will try this later today. Thanks

[aquartlow]

FWIW, I had an older Jacobs Mileage Master ignition box w/ Ultra coil that didn't work(bought them at a flea market for $10). I found that the smaller gauge black wire needed to be grounded for the ignition box to work, I removed some of the urethane/potting material on the underside of the box where that smaller gauge black wire was running and found the solder joint was bad. A little solder/soldering iron work and a little silicone to seal it up and the box worked great. I realize the newer boxes may not require that this wire to be grounded, but just a thought. Good luck.

[In-Tech]

The Jacobs orange + and purple - wires should connect to the distributor mag trigger wires the same as the MSD green - and purple +. Note the purple wires are opposite polarity, Jacobs purple is - and MSD purple is +, so you would not connect the purple Jacobs wire to the same distributor wire as the MSD purple did, but the opposite. Be sure the green wire is not hot or grounded, tape it off.

I don't know why anybody would like this guy/poster.