[DeTomaso] pantera electricals

F&D Terry gt5s at bcpl.net
Fri Jun 1 07:47:42 EDT 2007


I understood the problem to be the single ground wire that connects all 
the forward electrical devises to the ground stud. That is what my 
article addressed. The stud itself is not in question.

Fred T.

JDeRyke at aol.com wrote:

>With all the talk about the inadvisability of relying only on the 'under-dash 
>ground stud', remember that stud is not just welded to the underside of the 
>cowl: it penetrates the sheet metal and becomes the ground lug for the battery 
>(at least in its stock position)! Theoretically, this should be ideal given 
>that the dash and console where all the gauges and switches live are insulating 
>fiberglas. I suspect that most problems with under-dash grounds are in fact 
>simple corrosion or looseness of the nut on the stack of grounding wires, which 
>we used to tediously fix by removing everything from the under-dash stud, 
>wire-brushing every connecting loop bright 'n shiny, and re-attaching the wires 
>with a firmly-torqued nut and washer. In hot, dry areas, you might do this once 
>in a Pantera-lifetime; in wet humid areas, quite a bit more often.
>A second problem with loose ground connections is the inadvertent creation of 
>ground-loops that don't route electrons directly back to the battery, but 
>send them on long circuitous paths from 'less-grounded' to 'more-grounded-but-not 
>quite-battery-grounded'. Try this: while looking at your gauges on a 
>warmed-up engine at idle, turn on the headlights (momentary heavy current draw). You 
>may find your temp gauge reading drops, oil pressure reading changes and even 
>the fuel gauge reading drops! This is a sure sign of ground-loops somewhere in 
>the gauge panel wiring, and the need to scrub corrosion off the under-dash 
>ground post and both ends of the battery ground cable, at least as a start. 
>FWIW- J DeRyke (who hates wiring problems!)
>
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