[DeTomaso] Grounding Circuit Recommendations

[JDeRyke at aol.com]

There's another possible benefit here besides a little better ignition. A few 
years ago, I noted an electric cell being generated inside our cooling system 
by using a sensitive VOM (a Fluke 80204B). I stuck one probe in the 
water/anti-freeze inside the reservoir while grounding the second probe (0-200mV 
scale), and read about 20 millivoilts due solely to electrochemical action. Then I 
turned on the ignition (engine off) and noted a jump in voltage...   pulling 
fuses one at a time, I located one circuit that was not adequately grounded, and 
concentrated my efforts on components on that circuit. The result was a more 
stable indicated water temperature on the stock gauge. 
This was not my idea- the Corvette guys with their almost all-aluminum 
cooling systems have long had such problems, and their rule of thumb is, if over 70 
millivolts shows on a sensitive VOM, it means your engine is dissolving unless 
you do something; sacrificial anodes, better anti-corrosion additives in your 
anti-freeze etc. Something to think about- J Deryke


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