Sorry, there is no High Beam relay.
If the hi beams and the indicator don't work, check fuse 33 (15A).
Also check Fuse 12 (30A) under the hood.
If fuse 33 and 12 are good, check for power on the GY/OG wire coming out of the Multifunction switch when you have the switch in the High Beam (with Main head/park switch on Head) or Flash to Pass positions. Power absent = bad MFS.
If you want a schematic and MFS test procedure, send me a PM with your e-mail address. I have 2000 EVTM, but it should be the same for a 99.
2000 2.5 MO5D 4.10 one-wheel drive DD - gave to my older son
1990 STX 87 2.9 going in.....Junked it
2000 3.0 4WD M05D 4.10 S-cab Off-Road package with 235-75-15" tires, hotrod DD, lol