Northstar Engines and System Technical Discussion Discussion, Coolant fan wiring in Cadillac Engine Discussion; In my review of a recently purchased '96 Eldo, I find an absolute butcher-job of a cobbled together wiring mess ...
In my review of a recently purchased '96 Eldo, I find an absolute butcher-job of a cobbled together wiring mess of the three fan relays. It was deemed prudent to just replace (splice) the relays and wiring from a '96 Seville parts harness laying around; all the colors matched up. There are two yellow wires coming out of the harness, each one tied to pin 87a of relay #1 and #3. BUT, when consulting the '96 shop manual (pg.6E-37), these pins are blank.
Looking at the '98 shop manual (pg.6-224) these two relay pins (87a) are connected together (wit a YELLOW lead), but don't go into the harness.
Reading the schematic of the fans, tying pins 87a (relays 1 and 3) together makes no sense; it doesn't DO anything.
Bottom line is, I wired (soldered) the relays into the harness, but what are those yellow leads for?
It is odd that the yellow seems to be nothing more than a completion of a circuit which goes nowhere.
In the 2000+ diagram those two relay pins are blank - the "yellow wire" is gone. BUT, the relays are IN the 2000+ underhood fuse box, not external, so the equivalent PCB trace is not there..............