Ground Loops (non aviation)

[Shannen Durphey]

Ahhh... 
>From what I've seen, more than one location.  One or two at the
bellhousing is common, and a couple more at the t-stat housing on 8
cyls.

Always wondered why O2 circuit was grounded at the thermostat housing
on 8 cyl trucks.  The bolts always get corroded.  I've had to chase
some good driveability bugs because of this.
Shannen

Bruce Plecan wrote:
> 
> On grounding:
> GM seems to ground all the ecm stuff thru one point on the engine.
> Somestimes on the heads, sometimes on the intake.  I would **ASSUME**, this
> is to prevent ground loops?.  Is the reason cause of where the alternator is
> grounded there, or the mass of the block to act a sort of a capacitor, or
> what?.  Would there be a big difference in grounding things at the firewall,
> and relying on the original ground strap, and battery cable to be the
> grounds?.....
> The reason I ask is that on some applications the grounds are really
> impossible to get to.
> Grumpy
> 
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