drop in voltage of wiring harness - Defender Source
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Old April 21st, 2007, 11:06 PM
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Chris Davis
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drop in voltage of wiring harness

My radio stopped working the other day. I deduced that the constant-on power was reading only 4 volts. This is the purple wire in the wiring harness. I ran a dedicated hot to the radio to solve the problem and stopped using this wire BUT, and here is why I am concerned, the purple wire still has an issue. If it is seeing 4.6 volts but all the other hot wires show 12, WHY is it doing that and is there possibly a drain on the battery do to a short somewhere in the system? I am trying to trace this wire back to the fuse box, and I think it is the top row of fuses, the second to the right, and when I pull it the voltage slowly goes to zero on the wire. This also slightly worries me because with the fuse pulled, you would expect it to go quickly to zero (but there may be some discharging capacitance in the system, maybe).

Anyone ever see this? Does anyone have a wiring harness schematic? Thanks,
C
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Old April 23rd, 2007, 11:40 AM
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Chris Davis
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Anyone?
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Old April 23rd, 2007, 01:34 PM
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Hey Chris! I had to reply, but I would pull the fuse and measure the resistance between the fuse and the end of the purple wire, I forget what other circuits does that fuse power up? Does your volt meter measure current? Can you measure the drain on the battery with everything off then pull the radio fuse to see if there is any difference?
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Old April 23rd, 2007, 01:49 PM
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Mike! You're back!
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Old April 23rd, 2007, 01:59 PM
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Quote:
Originally Posted by JimC
Mike! You're back!
Every now and then (free time is a little limited). But my 90's not quite back,,, worked on it this weekend a bit (I have sun burns to prove it) but it still needs a bit of work and a set of tires before it's going anyplace.
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Old April 23rd, 2007, 02:34 PM
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back with the living, you out for s drink tomorrow Mike??
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Old April 23rd, 2007, 03:06 PM
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Good advice, Mike. I will check the current draw.

Cheers,
Chris
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