Question about Cars & Trucks
There are two power wires to most radios. usually red and yellow. the red wire provides 12v when the key is turned on and yellow provides a constant 12v. both must have power to turn the radio on. there will be two fuses for the radio also so make sure both fuses are good. the only other thing that will keep the radio from coming on is the ground wire "usually black" that has to be connected to the ground in the factory harness or you can just connect it to any bare metal behind the dash
Posted on Oct 20, 2012
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Posted on Jan 02, 2017
There should be (at the minimum) a power wire (usually red) a ground wire (usually brown) and at least four wires for 2 speakers (left power and ground, right power and ground)... there may be an additional power wire (one is switched through the ignition, one with constant power from the battery) my guess is that the wire with the inline fuse is constant power from the battery. Test this "tan and yellow" wire and the red one with a light or a meter... which one only has power with the ignition on? if this wire is never hot then it's probably a ground (but try to find out for sure by connecting the wire to one side of a meter and the other to the battery neg or another known good ground and see if you have continuity)
The reason for two power wires is that some radios (especially new ones) need a small amount of constant current to maintain memory settings (station presets)... another tip to reduce trial and error is to use a "d" cell battery to figure out which wires go to which speakers... just brush them against the battery + and - and the corresponding speaker will emit some "static"...! Hope this helps...;-)
Posted on Apr 24, 2009
First of all you will only have voltage for 2 seconds after key is turned on from the fuel pump relay. after that when you begin to spin the engine over oil pressure then builds up and closes the contacts on the oil sending unit causing the fuel pump to stay powered up as long as it's spinning or it's crunk and running.
so while you check for power on the tan with white stripe at fuel pump , have someone bump the engine over, if you have power up until about 2 seconds after they let off the key then check ground to pump if it's ok then you'll need a fuel pump.
If you don't have voltage when it's spun over then check the red wire coming from the oil sending unit the same way you checked it at the fuel pump.
If you have voltage then check inline fuse beside the battery. if fuse is'nt blown then check for broken wire from there to fuel pump.
If you don't have voltage from red wire at oil sending unit then check for voltage on orange wire at sending unit, if you have voltage on the orange wire and not on the red wire while someone is spinning it over then replace the oil sending unit.
If you wanna do a quick check that makes sure your relay isn't the problem Go to your 12 way diagnostic connector under dash by stearing wheel. and touch a battery hot wire to pin G if relay is ok the you should hear the fuel pump come on.
Posted on Jan 13, 2010
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