HEI Problem - The 1947 - Present Chevrolet & GMC Truck Message Board Network

1-PU70 · 11-09-2004, 06:26 PM

The tack side of the HEI is hot with the key on. I dont think this is right. If there is something wrong would it be the module? AM I missing something?

67ChevyC10Stepside · 11-09-2004, 11:01 PM

i think it should be hot...there is power going to it when the key is on for the hole system to work....and it sends power to the tach to tell it to zero....then the pulses make the tach work.

1-PU70 · 11-09-2004, 11:21 PM

So its hot with the key on and then after it starts in not?

67ChevyC10Stepside · 11-09-2004, 11:38 PM

i think it's solid hot and pulses when running...hook a tach wire to the terminal start the motor and hold the end of the wire...you will feel the pulses.

Hooter · 11-10-2004, 02:03 AM

plus the power coming out of the tach side of the coil is AC not DC so it will give a funny DC reading, But AC you will notice the voltage stay the same at any given RPM

11-09-2004, 06:26 PM	#1
1-PU70 Registered User Join Date: Apr 2000 Location: Bradenton, FL Posts: 1,036	HEI Problem The tack side of the HEI is hot with the key on. I dont think this is right. If there is something wrong would it be the module? AM I missing something? __________________ 1970 CST/10 402,700R4,3:73 posi,AC,PS,PB,TLT,PW,Buckets with heaters

11-09-2004, 11:01 PM	#2
67ChevyC10Stepside Registered User Join Date: Mar 2004 Location: Butler PA Posts: 3,034	i think it should be hot...there is power going to it when the key is on for the hole system to work....and it sends power to the tach to tell it to zero....then the pulses make the tach work. __________________ 67 c-10, 400 SB, TH350, 4.10 gears, Blazer tank,camaro tach, sidemarker fuel fill (soon) WTB: stepside parts, 67 front end parts, 67 small window cab. posi for 3.73 or 4.10 for 12 bolt and 10 bolt.

11-09-2004, 11:21 PM	#3
1-PU70 Registered User Join Date: Apr 2000 Location: Bradenton, FL Posts: 1,036	So its hot with the key on and then after it starts in not? __________________ 1970 CST/10 402,700R4,3:73 posi,AC,PS,PB,TLT,PW,Buckets with heaters

11-09-2004, 11:38 PM	#4
67ChevyC10Stepside Registered User Join Date: Mar 2004 Location: Butler PA Posts: 3,034	i think it's solid hot and pulses when running...hook a tach wire to the terminal start the motor and hold the end of the wire...you will feel the pulses. __________________ 67 c-10, 400 SB, TH350, 4.10 gears, Blazer tank,camaro tach, sidemarker fuel fill (soon) WTB: stepside parts, 67 front end parts, 67 small window cab. posi for 3.73 or 4.10 for 12 bolt and 10 bolt.

11-10-2004, 02:03 AM	#5
Hooter My other Love Join Date: Aug 2001 Location: Castlegar B.C. Canada Posts: 4,085	plus the power coming out of the tach side of the coil is AC not DC so it will give a funny DC reading, But AC you will notice the voltage stay the same at any given RPM __________________ Castlegar B.C.The great white North (Canada Eh!) Hooter_5@hotmail.com First generation Monte Carlo club pictures of my life



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