I just bought a 94 sierra. When I engage 4 wheel drive the indicator (the
one that lights up the picture of the front wheels on the floor board
console) doesn't light. The light for rear wheel drive stays on all the
time, is that normal? The bulb is good and four wheel drive DOES engage.
Does anyone know what controls the light and where it's located? Thanks.
I think I figured it out. It has an electric, thermal actuator that locks
the front axles. It's supposed to plunge forward after it reaches a certain
temperature and lock the axles. Took it out and applied 12 volts to it and
nothing happens. So I'm betting that's the problem. Thanks for the
if your actuator is bad, DON"T replace it with the same part.... GM
redesigned the part in '98. the newer electromechanical actuator is almost
instanteous compared to up to 30sec engagement for the older thermal
actuator. I bought mine for ~65 bucks from www.gmotors.com. Napa's price
for the older type actuator is ~85 bucks.
Must be some old stock. We haven't been able to
get a thermal actuator for a while now. By the way,
you will also need the updated wiring harness for the
new style actuator. The wiring harness also includes
a spacer that "must" be installed along with the new
actuator, or else it won't work properly.
the part # for the improved actuator is 26060073. the harness for my
'88k2500 is part # 88959465.
I paid $76.85 for the actuator and $21.64 for the harness from
you'll have to check with a parts dept for the proper adapter harness for
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