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post #1 of 3 (permalink) Old Sep 22nd, 07, 05:37 PM Thread Starter
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Join Date: Jun 2007
Location: Allendale, MI
Posts: 54
not starting

Hello. Just installed 502 in 67. Trying to get it started. Have GM HEI with BAT wire connected to the spade terminal on the Ignition spot on fuse block with nee 12 gauge wire. I have a brand new optima battery. When I go to run position the electric fuel pump kicks on and then when I go to crank nothing happens including the fuel pump goes off. I measured voltage at the HEI connector and it has 11.8 -11.9 volts but when I go to crank it drops to 3 volts. I am confused.

96 Z-28 vert
67 Coupe 502BBC TH400
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post #2 of 3 (permalink) Old Sep 22nd, 07, 11:29 PM
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Join Date: Jul 2001
Location: Pontiac IL
Posts: 453
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Re: not starting

The IGN terminal at fuse box might not have power in the crank position. Disconnect everything from that terminal, hold key on crank position and check if it has power. if it shows 12v but drops to 3 when cranking, you have a poor connection somewhere.

Greg U

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post #3 of 3 (permalink) Old Sep 23rd, 07, 04:52 PM
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Join Date: Mar 2002
Location: Austin, TX, USA
Posts: 5,277
Re: not starting

IGN should be hot in crank and run. ACC is only hot in the accessory and run positions - not crank. So first off, be sure you are in fact hooked to an IGN source. Second, I believe I've heard folks talk about 67 ignition switches not having a hot IGN in the crank position. My 68 IGN is hot during crank.

68 Coupe, 350 w/ Edelbrock Performer RPM heads, cam, intake, 700R4, Dave's small body HEI
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