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#1
05-28-2024, 05:21 PM
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Can anyone tell me what this is for?
Hi guys,
My brother’s 74 GT has a crank, no start issue and I will be starting to diagnose it for him tonight. I’m going to look at neutral safety and module type issues but what is this fuse holder for that appears to go to the HEI? Thanks
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The More People I Meet, The More I Love My Dogs! |
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#2
05-28-2024, 06:43 PM
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unless I am mistaken the fuse links were in the charging system - but I am more familiar with those pesky parts on a 1973 engine.
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1970 Formula 400 Carousel Red paint on Black standard interior A no-engine, no-transmission, no-wheel option car. Quite likely one of few '70 Muncie three speed Formula 400's left. 1991 Grand Am: 14.4 @ 93.7mph (DA corrected) (retired DD, stock appearing) 2009 Cobalt SS: 13.9 @ 103mph (current DD; makes something north of 300hp & 350ft/lbs) |
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#3
05-28-2024, 09:26 PM
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That looks like the tach wire.
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So long, farewell. |
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#4
05-30-2024, 11:21 AM
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The brown wire is the signal for the tachometer off of the coil negative. It has an inline fuse to protect the tachometer, I seem to remember it's a pretty low value like 2 amp.
Common failures that cause a no start on an HEI: A loose or corroded connection. Coil pickup wires broken. (fairly common) Bad HEI module. Common with no-name after market modules. Try to use the original GM "990" module. Link to the HEI manual: http://www.pontiacpower.org/HEI.pdf BTW, later production 1974's got HEI from the factory.
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