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Jeep Wrangler YJ
YJ General Discussion
Help with 4WD indicator light
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<blockquote data-quote="DOWNS" data-source="post: 440114" data-attributes="member: 21038"><p>If the hose is unplugged at the t-case you won't feel any vacuum at the swtich. The 4 hole plug is where your vacuum comes from and the switch allows vacuum to actuate the vacuum motor on the front axle. You should feel vacuum on one of the 4 hole plug ports when running. The t-case and the swtich don't generate any vacuum on their own. </p><p></p><p>If you don't have vacuum at the 4 hole plug (the connector on the Jeep side not the switch on the t-case side) then you need to follow the vacuum harness forward and do more checking. </p><p></p><p>It's not uncommon for these semi-flexible vacuum lines to break at the age most of the Jeeps are at.</p></blockquote><p></p>
[QUOTE="DOWNS, post: 440114, member: 21038"] If the hose is unplugged at the t-case you won't feel any vacuum at the swtich. The 4 hole plug is where your vacuum comes from and the switch allows vacuum to actuate the vacuum motor on the front axle. You should feel vacuum on one of the 4 hole plug ports when running. The t-case and the swtich don't generate any vacuum on their own. If you don't have vacuum at the 4 hole plug (the connector on the Jeep side not the switch on the t-case side) then you need to follow the vacuum harness forward and do more checking. It's not uncommon for these semi-flexible vacuum lines to break at the age most of the Jeeps are at. [/QUOTE]
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Jeep Wrangler YJ
YJ General Discussion
Help with 4WD indicator light
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