Full story below. Short question here.
Basically, I have a W/P wire that's hot in the accessory or run position, and it's only showing 7 volts. I think it may be throwing off several gauges that do/may run off of it as reference voltage. I don't trust it any longer.
I want to take the yellow power wire for the radio, which I believe is also hot in the accy/run position, use that to switch a relay, and tie the straight-from-battery hot to feed the W/P wire with a full 14V. I don't see any problem? There's nocritical reason in fact that the radio and these gauges should have been fed by different wires? Maybe only practical considerations of where each wire would be going to.
I changed a whole bunch of stuff all at once, so I never quite knew what went wrong, where. Been sorting it out over the past couple of weeks.
Specifically, I added 4 sunpro gauges and a trigger wire for an electric fan onto a W/P (white with pink-purple stripe-- although it looks more like pink with a white stripe) wire coming off of the cluster of wires in the big harness under the steering wheel.
This wire is hot on accessory and in run.
This wire is responsible for all sorts of gauges that are on in accy/run; I've got the wiring diagrams...
Now, initially after tapping into it, my sunpro voltmeter (accurate, btw) read 10V. Meaning, of course, 10V on this line. My brake warning light was on very dimly. My gas gauge, since doing everything (so it could have been some other screwup), won't go past 3/4 full, although it reads empty in close to the same spot. I didn't put 3 and 3 together at first however.
10V is not good, obviously my sunpro oil gauge will read low with a low reference voltage, so yesterday I f*cked with it some more and added a relay switched by the W/P wire to send power from a 10gauge wire straight from the battery to my gauges. Much better.
Now, oddly, the brake warning light was on in full brightness...
I checked voltages again, and for whatever reason --I've gotten the wire as firmly in the harness as it will go, although I'm not ruling that out; and I trust in my soldering skills-- that W/P wire now has only SEVEN volts.
This is the reference voltage for several gauges.
Actually, I can't figure out how this W/P wire is related to the brake light, and I even glanced at the wiring diagrams, but when I unplug the 3-wire plug from the brake fluid reservoir, the W/P wire actually loses all voltage. Very strange; I thought the W/P wire was being fed FROM the ignition switch, and I haven't yet found in a diagram where it ties to the brake fluid reservoir, which has different wires coming immediately from it.
Anyway, doesn't seem coincidence that I have the feed wire for my fuel gauge, oil gauge, and a couple other things, and it would seem indirectly for the brake indicator light too, showing 7V; and having a problem with my fuel gauge never showing more than 3/4 full, and my brake light out.
I'm thinking about circumventing the W/P wire and feeding it with battery voltage switched from the radio hot, instead of using the ignition switch out of the steering column harness.
Basically, I have a W/P wire that's hot in the accessory or run position, and it's only showing 7 volts. I think it may be throwing off several gauges that do/may run off of it as reference voltage. I don't trust it any longer.
I want to take the yellow power wire for the radio, which I believe is also hot in the accy/run position, use that to switch a relay, and tie the straight-from-battery hot to feed the W/P wire with a full 14V. I don't see any problem? There's nocritical reason in fact that the radio and these gauges should have been fed by different wires? Maybe only practical considerations of where each wire would be going to.
I changed a whole bunch of stuff all at once, so I never quite knew what went wrong, where. Been sorting it out over the past couple of weeks.
Specifically, I added 4 sunpro gauges and a trigger wire for an electric fan onto a W/P (white with pink-purple stripe-- although it looks more like pink with a white stripe) wire coming off of the cluster of wires in the big harness under the steering wheel.
This wire is hot on accessory and in run.
This wire is responsible for all sorts of gauges that are on in accy/run; I've got the wiring diagrams...
Now, initially after tapping into it, my sunpro voltmeter (accurate, btw) read 10V. Meaning, of course, 10V on this line. My brake warning light was on very dimly. My gas gauge, since doing everything (so it could have been some other screwup), won't go past 3/4 full, although it reads empty in close to the same spot. I didn't put 3 and 3 together at first however.
10V is not good, obviously my sunpro oil gauge will read low with a low reference voltage, so yesterday I f*cked with it some more and added a relay switched by the W/P wire to send power from a 10gauge wire straight from the battery to my gauges. Much better.
Now, oddly, the brake warning light was on in full brightness...
I checked voltages again, and for whatever reason --I've gotten the wire as firmly in the harness as it will go, although I'm not ruling that out; and I trust in my soldering skills-- that W/P wire now has only SEVEN volts.
This is the reference voltage for several gauges.
Actually, I can't figure out how this W/P wire is related to the brake light, and I even glanced at the wiring diagrams, but when I unplug the 3-wire plug from the brake fluid reservoir, the W/P wire actually loses all voltage. Very strange; I thought the W/P wire was being fed FROM the ignition switch, and I haven't yet found in a diagram where it ties to the brake fluid reservoir, which has different wires coming immediately from it.
Anyway, doesn't seem coincidence that I have the feed wire for my fuel gauge, oil gauge, and a couple other things, and it would seem indirectly for the brake indicator light too, showing 7V; and having a problem with my fuel gauge never showing more than 3/4 full, and my brake light out.
I'm thinking about circumventing the W/P wire and feeding it with battery voltage switched from the radio hot, instead of using the ignition switch out of the steering column harness.
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