Join Date: Dec 2002
Location: Saint Louis, Missouri
Re: Spark between neg. cable & post?
Do you have a dedicated wire run from the battery positive post to the starter AND a dedicated wire from the battery negative to the engine ?. A lot of installs of trunk mounted batteries I've seen people ground the battery in the trunk and then at the firewall add a wire from there to the engine and sometimes it works and continues to work just fine and other times they initally don't work good or become worse later down the road. Some car's I've seen also the terminals on the wire are not done properly and may work at first but later corrode. Some installs also do not have large enough wire size to support the current draw of the starter.
As far as the spark this should not happen unless something is on and drawing power. I've heard of one wire alternators being bad and maybe try disconnecting the wire off of the back of it and see if the sparking still occurs. If it continues start checking for other things like a trunk light on, console light on, cigarette lighter pushed in, and so on. If you have a meter this would help out also. If you also have a stereo with a digital display then there will be a constant 12 volt wire to it you may try disconnected to narrow down the search.
1974 Spirit Of America Nova (being restored), 1973 Nova Custom, 1968 Chevy II (Garage Find 2012)
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