4wd indicator light goes out under acceleration
New Member
Joined: Dec 2013
Posts: 4
I have a 1995 chevy blazer two door with a manual transfer case. Through due diligence and repairing I have installed a new vacuum actuator, a new transfer case shift cable, and a new vacuum switch. Everything seemed cool until it snowed last weekend. Four wheel drive seems to be working at low speed as I tried to make a tight turn to test it and it tightened up. But when driving under acceleration the lights on the front wheel indicator go out. Let off the gas and they come back on. Any ideas. Hopefully I gave you enough info.
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Joined: Mar 2009
Posts: 8,453
From: Belleville, Michigan
If the engine runs well, this indicates there is sufficient vacuum. Did you test the vacuum check valve? Did you check the vacuum lines at the vacuum switch yet? Check each line separately and make sure it holds vacuum, and that they are not restricted. You'll need a hand vacuum pump and a vacuum gage to check them. Or you can replace them, (one at a time) to make sure they are connected properly.
Last edited by Captain Hook; Dec 9, 2013 at 03:54 PM.
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