New Summit Dizzy.........now tach doesnt work - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Paso76GMCstepper · 09-25-2006, 12:12 AM

Hey everyone I bougt a new dizzy from Summit. The only diff in this one and the stock one is there was a third metal tab in the 3 prong plug. Well I didnt think that was wierd because the new cap and plug had 3 connctions the old one only 2. It runs so much better now. I stabbed it one time and timed it to 10 degrees with the vaccum advance pluged. Absolutly no spark knock. It acts like the tach is going bacwards. It worked perfect with the old dizzy.

Any suggestions guys.

Thanks in advance.

Tony

this is in my 76 K15 350 the part number is

SUM-850001R

beaterC10 · 09-25-2006, 07:53 AM

Are you saying the new cap or old cap had three connections? Have you pulled the dust covers on both caps and compared the coil connections? It would be possible to get the coil leads in the wrong position on the cap.

Paso76GMCstepper · 09-25-2006, 11:12 AM

Well the new one has 3 connections. The old plug had the place for a third but its blank. The new one has 3 prongs insted of two. I didnt check under the dust cap. It that was the problem would it still run so well?

Let me know Im gonna go on a dump run with her and will look into it more when I get home in a fw hours.

Thaks for the help/

Im gonna call Sumit this morning also

beaterC10 · 09-25-2006, 02:41 PM

I don't know what affect crossing the leads would have on performance. I remembered that the coil wires were simple to cross up. I had the HEI apart too many times before I just replaced it. You might want to also make sure the connectors are properly seated and aren't coming loose. I have had issues in the past because of that.

09-25-2006, 12:12 AM	#1
Paso76GMCstepper Registered User Join Date: Jan 2004 Location: Paso Robles, CA Posts: 347	New Summit Dizzy.........now tach doesnt work Hey everyone I bougt a new dizzy from Summit. The only diff in this one and the stock one is there was a third metal tab in the 3 prong plug. Well I didnt think that was wierd because the new cap and plug had 3 connctions the old one only 2. It runs so much better now. I stabbed it one time and timed it to 10 degrees with the vaccum advance pluged. Absolutly no spark knock. It acts like the tach is going bacwards. It worked perfect with the old dizzy. Any suggestions guys. Thanks in advance. Tony this is in my 76 K15 350 the part number is SUM-850001R __________________ Tony "Life is a Team Sport" To the memory of the Hendrick Motorsports Plane Crash Victims Last edited by Paso76GMCstepper; 09-25-2006 at 12:14 AM. Reason: spelling errors

09-25-2006, 07:53 AM	#2
beaterC10 Senior Member Join Date: Jul 2003 Location: Indianapolis, IN Posts: 1,277	Re: New Summit Dizzy.........now tach doesnt work Are you saying the new cap or old cap had three connections? Have you pulled the dust covers on both caps and compared the coil connections? It would be possible to get the coil leads in the wrong position on the cap.

09-25-2006, 11:12 AM	#3
Paso76GMCstepper Registered User Join Date: Jan 2004 Location: Paso Robles, CA Posts: 347	Re: New Summit Dizzy.........now tach doesnt work Well the new one has 3 connections. The old plug had the place for a third but its blank. The new one has 3 prongs insted of two. I didnt check under the dust cap. It that was the problem would it still run so well? Let me know Im gonna go on a dump run with her and will look into it more when I get home in a fw hours. Thaks for the help/ Im gonna call Sumit this morning also __________________ Tony "Life is a Team Sport" To the memory of the Hendrick Motorsports Plane Crash Victims

09-25-2006, 02:41 PM	#4
beaterC10 Senior Member Join Date: Jul 2003 Location: Indianapolis, IN Posts: 1,277	Re: New Summit Dizzy.........now tach doesnt work I don't know what affect crossing the leads would have on performance. I remembered that the coil wires were simple to cross up. I had the HEI apart too many times before I just replaced it. You might want to also make sure the connectors are properly seated and aren't coming loose. I have had issues in the past because of that. Last edited by beaterC10; 09-25-2006 at 02:42 PM.



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