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Old 02-27-2008, 11:19 AM
Arthur Dalton Arthur Dalton is offline
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Join Date: Aug 1999
Location: Florida / N.H.
Posts: 8,804
Grounding the motors neg. side simply means you have taken the switched ground control circuit out of the system. [ by-passed]
So , you MAY have a bad regulator, but you could also have no variable trigger voltage to the regulator. The regulator has to have a trigger signal in order to complete the blower ground circuit. No trigger sig =no blower.
You want to check the 3 wire connector at the firewall , behind the brake booster. You need var/voltage at yellow wire for the reg to work.
The wires there are rd/blk/yl.
r to blk-12v
y to blk- var 2-8 volts , depending on speed selection.
If no var voltage at yellow, then the problem is upstream from that connector, not downstream/regulator...
A Dalton

Last edited by Arthur Dalton; 02-27-2008 at 11:37 AM.
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