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Re: Blower motor doesn't work on high
Sounds like a bad connection at a plug- look for burnt/melted plastic at all connections- and yes you tested voltage, but that is only half the circuit- the ground connector and plugs are also trying to carry the massive current required of a high blower setting. This is why a relay is used- to avoid sending high current (amps) through your control head fan selector switch. You can tell which wires carry the high speed by their size. Big wires are for big current, all others are just for controls switching etc..
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Automotive A/C Engineer with:
'99 IH 4700 Toy Hauler
(2) '95 GEO Prizms both maroon
'99 GMC Yukon
'95 Chev 3500, 454 Dually Crew Cab- 145k miles-
Wife's Camel trailer puller.
'94 Astro- 370k miles
'94 Firebird Formula- 5.7L 180k miles- gone-
'92 Chevy Lumina Van 3.8L 264k
'86 GMC S-15 - 2.8L 154k
'87 Buick Park Ave . 187k
'86 Buick Park Ave 3.8L 199k miles- gone
'77 Chevy Vega- 2.5L 175k miles gone but not forgotten
'68 Camaro 396 4 spd RS/SS -72k miles-
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