Gary Lewis Posted April 21, 2018 Share Posted April 21, 2018 I think that pigtail may be the power for the underhood light. It's an unused ground. Here's a little clearer view of it on my truck. Easier to see with no engine;). It is crimped in the firewall end of the engine ground cable. I found some interesting information here: Electrical/Grounds/Engine To Firewall Ground. Link to comment Share on other sites More sharing options...
Rembrant Posted April 21, 2018 Share Posted April 21, 2018 I found some interesting information here: Electrical/Grounds/Engine To Firewall Ground. Well ain't that slick. You are SUCH a keener Gary! So then...what is the "ECA" used on some trucks? Is this something in the EEC-IV system? Link to comment Share on other sites More sharing options...
Gary Lewis Posted April 21, 2018 Share Posted April 21, 2018 I found some interesting information here: Electrical/Grounds/Engine To Firewall Ground. Well ain't that slick. You are SUCH a keener Gary! So then...what is the "ECA" used on some trucks? Is this something in the EEC-IV system? ECA means Electronic Control Assembly. The computer for the EEC (Electronic Engine Control) is called an ECA, while the whole system is called EEC-III, or EEC-IV, or ..... You can see that here: http://www.garysgaragemahal.com/electronic-engine-control.html Link to comment Share on other sites More sharing options...
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