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Old Jan 5, 2020 | 03:41 PM
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That was what we wanted to hear. sounds like something is wired into those lights that is back feeding them. Check for splices from the ignition and light switch. Is there a newer radio or any other obvious addons?
 
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Old Jan 5, 2020 | 03:42 PM
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Question 4
I am talking about the instrument panel light where the light is for speedometer fuel temp alt oil .
the two red lights which are the alterna and oil light
work fine the go out when truck is on
 
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Old Jan 5, 2020 | 03:45 PM
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Got that. Something is feeding that circuit when the key is on.
 
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Old Jan 5, 2020 | 04:06 PM
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There’s no radio and for what I can see there’s no obvious splice that I can see
 
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Old Jan 5, 2020 | 04:08 PM
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No add ons
the battery is always connected and never drains
 
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Old Jan 5, 2020 | 04:14 PM
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Then were back to a bad light switch.
 
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Old Jan 5, 2020 | 04:28 PM
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Alex, I'm thinking that the instrument panel case is getting 12V + when you turn the key on. Then when you turn the head lights on it puts 12V+ to the instrument light wire, so you have 12v+ on both sides of the bulb and the light goes out.

Put your test light clip the "-" battery post and touch the probe to the instrument panel case with the key on, I'll bet it is live.
Eric
 
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Old Jan 5, 2020 | 04:30 PM
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Is it still a bad light switch
is something feeding the ignition switch
 
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Old Jan 5, 2020 | 04:39 PM
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Originally Posted by Alex7581
Is it still a bad light switch
is something feeding the ignition switch
I think the light switch is fine, see if that instrument cluster case is hot with the key on
Eric
 
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Old Jan 5, 2020 | 04:45 PM
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If I am correct, if you pull the 2a fuse out of the fuse panel and check the 2 fuse connections with the key off they will both be dead, with the key on one will be hot, and if you turn the lights on with the key on, both connections will be hot with the fuse removed.
 
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Old Jan 5, 2020 | 05:01 PM
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When probing the cluster do I touch the plastic housing
 
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Old Jan 5, 2020 | 05:07 PM
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Originally Posted by Alex7581
When probing the cluster do I touch the plastic housing
no the back of the cluster is stamped sheet metal.where the light sockets plug into. do the light sockets have one wire or 2?
 
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Old Jan 5, 2020 | 11:19 PM
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Pulled fuse number 2 out
with no none are hot with key on one is hot
with the key on and light on none are hot
 
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Old Jan 5, 2020 | 11:21 PM
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None are hot with key off
with key on one is hot
with key on and lights on none are hot
 
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Old Jan 5, 2020 | 11:56 PM
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Ok were getting somewhere. What you need to do now is trace the wire that feeds those lights and where it's sourced or be spliced into.
 
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