Yo Todd,
Welcome!
Do you have good battery voltage over 12.6 volts on red/light blue wire (circuit 32) on starter relay's small terminal (it is at top of the relay as shown in below pic) @ passenger side inner fender when turning key to start?
Relay pic in an 89 5.8
Source: by Handy_andy_cv64
Wiring Diagram from ignition switch through NSS to ignition starter relay to starter.
http://www.revbase.com/BBBMotor/Wd/DownloadPdf?id=21074
Is relay securely mounted to a Rust/Grime Less section of fender?
Some non-Ford Motorcraft relays are being reported as Defective
, such as; "...second bad brand new AutoZone Valucraft starter solenoid (relay) by Cody8892000
Since you can jump the relay posts to engage starter to spin at normal speed,(I assume), battery is ok as well as posts are OK and clean, clamps and cables including grounds are ok.
Look at Fusible link M, circuit 37 in Wiring diagram... provides battery power to ignition switch. It may be damaged.
A, F, G, J, L, M, N, P, W & Y Location in Wiring Diagram in an 89; Fusible Link A-Brown 18ga to Rear Window Defroster; W-Blue 20g to Fuel Pump Relay; N-Blue 20g to EEC Power Relay; F-Blue 20ga to Trailer; Y-Blue 20ga to N.C.; L-Brown 18ga to ?; M-Brown 18ga to ?; G-Blue 20g to Exterior Lamps, Trailer; P-Blue 20ga to ?; & J-Green 14ga to Alternator
by Seabronc (Rosie, Fred W) at
http://broncozone.com/index.php?app=core&module=attach&section=attach&attach_rel_module=post&attach_id=10377
Location pics in an 85 & 89 (between the starter relay and alternator)"...the first two pics are of an 89 5.0. because of the loom i wasnt able to trace the wires...The second pic is at the starter relay to show you a fusible link wire (the green wire in my fingers you can see at the eyelet there is a black plastic block). the third pic is of my 85. i think that big block is another style fusible link ford used on older stuff (but im not sure)..."
Source: by shift1313 (Matt) at
http://broncozone.com/topic/15953-no-spark/page-2
http://web.archive.org/web/20130527184251/http://www.broncolinks.com/gallery_images/89BroncoFuseChart.jpg
89 Fuse Block Legend.
Miesk5 Note; is = to jem270's 88 Fuse Block pic @