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post #1 of (permalink) Old 01-05-2001, 10:45 AM Thread Starter
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Help with TR upgrade

I started to install the TR upgrade last night, and I'm having a little problem. I installed a msd 6a, blaster tfi coil, and cap rotor and wires. My 304 has the Centech wiring harness on it. The problem I'm having is that when I start it up, It won't turn off when I turn the key. I currently have the old + wire from old coil to red wire in the new msd harness, There were two wires that were on the old - terminal on the old coil, a yellow one for the tach, but I don't know what the other one if for, and it is not hooked up to anything now. any ideas would be appreciated.

Keith

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post #2 of (permalink) Old 01-05-2001, 04:53 PM Thread Starter
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Re: Help with TR upgrade

anyone, anyone, bueller, bueller.

Keith

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post #3 of (permalink) Old 01-05-2001, 05:34 PM
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Re: Help with TR upgrade

I beleive your alternator is backfeeding the system.
My MSD came with instructions and a diode(I think that's what it's called), IT goes in the tickler wire that goes to alt.

CTjeepnut

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post #4 of (permalink) Old 01-06-2001, 10:13 AM
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Re: Help with TR upgrade

Yeah the diode is definetly the answer , MSD calls it engine run on ( I was expecting maybe the cachunk, cachunk type but it is actually engine won't shut off run on . Pay attention to the instructions though cause it only works installed one way.

post #5 of (permalink) Old 01-06-2001, 12:38 PM Thread Starter
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Re: Help with TR upgrade

I will give that a try, which one is the trickle wire? My next question is my cap. I looked at the placement of my number one wire on the cap. It is located 2 spots counterclockwise from where the picture and the cap says its suppose to be. You know how the caps have the number 1 on top of it, mine is over 2. The cap and the picture in the book both match, could I have my timing all screwed up??? It seems to run fine, but has a backfire which I thought was because of an exhaust leak. And where does the old - wire from the coil plug into the new harness??

Keith

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post #6 of (permalink) Old 01-06-2001, 05:04 PM
 
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Re: Help with TR upgrade

Get the diode at Radio Shack. The package should cost about $2.

The wire you want to install the diode in is the #1 or A wire (usually smaller of the two) on the alternator Two wire plug.
'79 had the Delco 10-SI alternator, so there will be four connection points to your alternator.

2 on a plug that goes in the side of the case, marked on the back of the case A & B or 1 & 2. The first one should be connected to a white wire on the #1 terminal, and a slightly heavier red wire should be hooked to the #2 terminal, both in a plug type connector..

1 on the back, marked 'BATT', easy to identify because it's the one that the heavy red wire hooks to.

1 on the back, unmarked heavy bolt type terminal, that a ground wire should be hooked up to, but probably isn't.

Cut the wire close to the alternator and install the diode. If the engine still runs on, reverse the diode.
When the system works the way you want it, waterproof the connections as well as you can.


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post #7 of (permalink) Old 01-06-2001, 06:13 PM
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Re: Help with TR upgrade

The tickler wire is the small wire that is in the plug -in connector, I think it,s brown.
It doesn't matter where #1 wire is on the cap as long as the firing order is correct and the rotor points to that terminal when #1 cyl. is at TDC of compression stroke. If it runs good I'd say everythings ok, it's just that someone put in the dist. a couple of teeth out and compensated for that by changing wire positions.

CTjeepnut

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post #8 of (permalink) Old 01-07-2001, 03:22 PM Thread Starter
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Re: Help with TR upgrade

HEY IT WORKS, IT REALLY WORKS!!! Thanks to all that helped. It turns out that I had the diode in backwards. Well finished up today by installing the new plugs and cleaning up the wires. Turned the key, and VROOOOOOOOM and wouldn't you know, when I turned the key off the truck actually turned off. hehe Thanks again.

Keith

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