I installed 3 new micro relays in my 90 model. Here is the part #NTE R46-5012-6, these are rated at 12 amps. The OEM ones were just 5 amps. If you have a soldering Iron, solder and a bit of skill you can replace them quite easily.
Diagnosis - Temp fixhttp://web.ncf.ca/ag136/jBoxDiagnosis.htm. . .