89 silverado gauge swap altenator not charging

[Coyotesa]

Don't know if anyone can help but I just swapped my 89 silverado moon gauges for 94 gauges with tach. And now my volts show only 12v pretty sure it was 14v before the swap. I have the brown wire connected but not even the the battery light comes on, when starting the truck either.

 

[FrankieD61]

Don't know if anyone can help but I just swapped my 89 silverado moon gauges for 94 gauges with tach. And now my volts show only 12v pretty sure it was 14v before the swap. I have the brown wire connected but not even the the battery light comes on, when starting the truck either.

Does the batt light (little battery symbol) come on when you turn the key on? I know the batt lights in these trucks act as a diode and are kind of integral to the charging system. Check with a meter to make sure your alt is actually putting out the correct 14+ volts.

On my 93, the gauge maxes out.. when I tested the alt with a simple voltmeter, the alt was putting out a nice steady 14.5 volts. So in my case, it’s the gauge.

 

[Coyotesa]

Does the batt light (little battery symbol) come on when you turn the key on? I know the batt lights in these trucks act as a diode and are kind of integral to the charging system. Check with a meter to make sure your alt is actually putting out the correct 14+ volts.

On my 93, the gauge maxes out.. when I tested the alt with a simple voltmeter, the alt was putting out a nice steady 14.5 volts. So in my case, it’s the gauge.

The battery light doesn't come on when I start it. I tested it and it's good. I took an old light and even tried wiring it in line to test. The altenator is not charging.

 

[AK49BWL]

What happens if you connect the Alt wire to a power source while the truck is running? If that does nothing, check between the plug and alt connector for continuity. If there is continuity, replace the alt.

 

[Leeztruk]

When you spliced in the "new" cluster plug into the "old" harness, did you join the three "new" hot wires to your "old" harness? You may have a bad connection at your splice point. The three points of reference on the "new" plug being pins F, O, and U. The one pin on the "old" connector being pin A10.

What's interesting about your complaint is that I had the almost same problem when doing the same swap in my '89, although my cluster was from a '93. Volt meter started to act wonky. Replaced it with a non-tach cluster and the problem went away

 

[Coyotesa]

When you spliced in the "new" cluster plug into the "old" harness, did you join the three "new" hot wires to your "old" harness? You may have a bad connection at your splice point. The three points of reference on the "new" plug being pins F, O, and U. The one pin on the "old" connector being pin A10.

What's interesting about your complaint is that I had the almost same problem when doing the same swap in my '89, although my cluster was from a '93. Volt meter started to act wonky. Replaced it with a non-tach cluster and the problem went away

The three pink and black wires? I did put them together.

 

[Leeztruk]

Yep, thems the ones. You might want to pull the cluster and see if you have battery voltage on all three locations. Check continuity from pinA to the alternator connector to see if you have an "open" in the circuit

 

[Coyotesa]

When you spliced in the "new" cluster plug into the "old" harness, did you join the three "new" hot wires to your "old" harness? You may have a bad connection at your splice point. The three points of reference on the "new" plug being pins F, O, and U. The one pin on the "old" connector being pin A10.

What's interesting about your complaint is that I had the almost same problem when doing the same swap in my '89, although my cluster was from a '93. Volt meter started to act wonky. Replaced it with a non-tach cluster and the problem went away

The three pink and black wires? I did put them together

 

[Coyotesa]

Fixed it, checked the continuity from the altenator to the plug and there was nothing, ran a new wire and boom charging. Mayne the tugging in the wires to soldier them caused it to break.

 

[FrankieD61]

Fixed it, checked the continuity from the altenator to the plug and there was nothing, ran a new wire and boom charging. Mayne the tugging in the wires to soldier them caused it to break.

Good stuff! Love it when a post ends with a resolve!