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Old 06-18-2006, 10:54 PM
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ignition problem

i have a small problem i need to bypass.......now i have a 73 nova ...just dropped in a chevy 350....and im running a hei msd distributor, now the guy that had it beofre me had the hot lead going to the distr. conttected to the hot lead going to the elect. fuel pump and ran it through the fuse box.....now i noticed the distributor is not running the car right..and im figuring that becuase they are both running off of the same lead into the fuse box...maybee it creates a spike in voltage when it comes to the fuel pump thus reduces the volatge going to the distributor ....now i cut the wire and am now running the fuel pump off of one of the prongs out of the fuse box...where do i get power for the ignition ...i tried taking a wire in the engine compartment that whet hot when the key was turned but noticed that it only starts when ilet off of the key from start to running position.....i dont know where to run this ignition hot lead from ........can someone tell me where to tap it into..can the ignition wire be shared with any other components or does it have to have its own wire to the source....hopfully i have made it clear for anyone to tell me....thank you ....

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Old 06-19-2006, 01:38 AM
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Doc here,

OK, first separate the two , Fuel pump and Coil..together they are pulling at least 60 amps..wonder you haven't had failures or fires yet..

Place the fuel pump on a relay, and hook the *---->RELAY<----* Coil (#85)to a 12 volt, FUSED, switched,(key on) source..The other side of the coil (#86) to a properly bonded ground or body part..(burnish & Star-washer)

The Power will come from a proper gauged wire , fused , directly from the battery, to the normally open contact (#87)

The fuel pump will be fed from the center wiper (#30)

That will cure that problem..

Next find the wire that comes out of the Ignition switch.."Hot In Run" only..should be a 10 gauge pink or purple or orange..

This is the wire you want to extend to the coil..(ignition coil) IF you fuse it , with a performance coil, fuse it at 40 amps..OR the best way to go is FUSE LINK..it won't spike open at the drop of a hat like a fuse will (leaving you stranded without ignition power)

Next and this is the reason it won't start now..

Add your secondary Ignition , (provides power to the coil when in crank mode..when the switch shuts off power to the rest of the car as it passes through "Run" to "start")

To do that, you need to run a properly gauged wire , 14 ought to do , from the solenoid terminal marked "I" or "R" to parallel into the Batt lead of the coil..or + side of the coil. This will heat the coil up when cranking and it will then start..

To test now, just run a wire between the battery and the coil power, It should fire right up.

Doc
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Old 06-19-2006, 10:07 PM
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thanks alot doc,
im going to take your advice and see if it works...thank you for your time .....
brad
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Old 06-19-2006, 10:29 PM
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Doc here,

No problem!

Keep us updated!

Doc
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Old 06-20-2006, 09:45 PM
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hey doc

thank you man, i actually found the existing wire hiding in the old harness, so i hooked it up and it fires nice now....i might have some more questions down the road for you if you dont mind ...thanks again....brad
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Old 06-21-2006, 12:34 AM
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Doc here,

No Problem, glad to help!

Kewl that is was still there, although hiding..makes it a bunch easier..

Keep us updated..

Doc
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