Duraspark 2 harness question
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Duraspark 2 harness question
Hi Guys, I'm converting my truck over to Duraspark 2. 84 F150 with 300 six. Does anyone know if I can use the wiring harness from a 78 F150 with a V8? Local junk yard had one, I got it hoping I could use the connectors if I have to build my own harness. I got the distributor, ICM, coil and bracket, and spark. Plug wires. Can you think of anything else I might need? Also, Rockauto has Motorcraft ICM for $36 bucks plus shipping if anyone is looking. Any info would be appreciated. Thanks
pedant
Joined: Jan 2008
Posts: 23,576
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From: EXTREME southwest CT
I guess I read too much into your junkyard foraging expedition. 
Sure you can use a V8 DSII harness.
Some of the senders on a I-6 might need extra wire to reach around back of the engine, but all the components and connectors are the same.
Sure you can use a V8 DSII harness.
Some of the senders on a I-6 might need extra wire to reach around back of the engine, but all the components and connectors are the same.
Cargo Master
Joined: Mar 2008
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From: Washington
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No factory tach. I have a aftermarket one that I haven't wired in yet thou. I had to wire in a key on ignition power source to the positive side of coil to get it to run. Now I'm wondering if I need a ballast resistor. When I search for info I get mixed results. Anyone know? I'm still reading about it.
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Cargo Master
Joined: Mar 2008
Posts: 2,567
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From: Washington
No factory tach. I have a aftermarket one that I haven't wired in yet thou. I had to wire in a key on ignition power source to the positive side of coil to get it to run. Now I'm wondering if I need a ballast resistor. When I search for info I get mixed results. Anyone know? I'm still reading about it.
pedant
Joined: Jan 2008
Posts: 23,576
Likes: 39
From: EXTREME southwest CT
You really need something to load the circuit in order to see the voltage drop.
The manual says to test for the resistor wire by ohming between coil positive and the run terminal of the DSII module connector.
You can see this path doesn't even require the key in the ignition.
The resistor wire should be in the main harness and meets a splice before the connector.
I just posted a DSII diagram in another thread...
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Thanks guys. I was just looking at the diagram in the other thread. Key on is about 12.3 and running looks like 15-18V and erratic. I will test like described above. Lol electricity has never been my my best subject, I think I licked the 9V battery a few to many times as a child!
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