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#1
04-23-2022, 08:42 AM
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74 Lemans wont shut off
So i bought a new tach to install in my Lemans. My current set up is a GM Hei wired through a Relay to provide the proper 12v to the Hei, have has No problems. Hooked up the new tach, green wire to Tach terminal on Hei, Black Ground and the Red I plugged into Bat terminal in center of Fuse box, started car and everything worked fine, go to shut car off and it keeps running, with key in off position pulled Red wire from fuse box and still running, pulled Green wire from tach and still running, so tach completely eliminated had to unplug the 2 plug in wires at Alternator to kill car. Now with the Alt unplugged car will start and turn off but plugged in it will not, and swapped out Alt with another known good one. Any thoughts whats causing this?
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1969 Judge, Matador Red, Black, RAIII 4Spd, Owned 33years 1974 LeMans GT Honduras Maroon, 3 speed stick 350 2brl. 1963 Catalina 389 Black with Burgandy Ventura interior SOLD 1970 GTO Pepper Green 400 YS auto Factory A/C 56K orig miles |
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#2
04-23-2022, 09:04 AM
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Feed back through the brown/light/excite wire is whats causing the run-on condition. Common problem with relays and MSD boxes. Adding a diode to the brown wire is the cure.
Strange that it didn't show up till you added the tach?? Clay |
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#3
04-23-2022, 09:27 AM
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Quote:
__________________
1969 Judge, Matador Red, Black, RAIII 4Spd, Owned 33years 1974 LeMans GT Honduras Maroon, 3 speed stick 350 2brl. 1963 Catalina 389 Black with Burgandy Ventura interior SOLD 1970 GTO Pepper Green 400 YS auto Factory A/C 56K orig miles |
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#4
04-23-2022, 12:02 PM
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Quote:
__________________
1969 Judge, Matador Red, Black, RAIII 4Spd, Owned 33years 1974 LeMans GT Honduras Maroon, 3 speed stick 350 2brl. 1963 Catalina 389 Black with Burgandy Ventura interior SOLD 1970 GTO Pepper Green 400 YS auto Factory A/C 56K orig miles |
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#5
04-23-2022, 12:31 PM
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Bar on the diode marking towards the alt.
George
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"...out to my ol'55, I pulled away slowly, feeling so holy, god knows i was feeling alive"....written by Tom Wait from the Eagles' Live From The Forum |
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#6
04-23-2022, 01:58 PM
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Quote:
__________________
1969 Judge, Matador Red, Black, RAIII 4Spd, Owned 33years 1974 LeMans GT Honduras Maroon, 3 speed stick 350 2brl. 1963 Catalina 389 Black with Burgandy Ventura interior SOLD 1970 GTO Pepper Green 400 YS auto Factory A/C 56K orig miles |
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