Quote:
Originally Posted by RollinCole
You were right, there was a fault with the wire. I ended up running a new wire to a switch instead because we could not trace the source of the problem but for some odd reason we later discovered that fuse #11 which is overdrive and glow plugs (25A) was blown and we totally forgot to check it before we made our repair...Could #11 have been the issue all along???
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Yes, it likely was. The glow plugs are typically on the same supply circuit as the IP solenoids and other engine controls in most of these. Not sure for that particular year but likely to be the case. Probably you could remove that extra wire and change the fuse, and it would work again on its own, for a while... but you'd want to track down whatever harness short caused it to blow in the first place.
One common insulation failure point is the 4-wire harness that plugs into the bottom of the GP relay, on the left-hand shock tower, which contains wires that could short that circuit if jostled on a big bump.
Also NB: early 700s are wired differently from later ones, but from 1984.5 onward the wiring for the A/C compressor shares Fuse 13 with the glow plugs and IP solenoid circuits. In diesel 700's the A/C compressor harness can chafe on the low side hose and then lead to a situation where turning on the A/C or defrost intermittently causes fuse 13 to blow and stalls the motor (with no restart). A bit of a dangerous situation in traffic...