Help, No power when turn key
Start with this MAD article. Whether you bypass the ammeter or not, it points up the "thing" with these systems:
http://www.madelectrical.com/electricaltech/amp-gauges.shtml
The diagram on that page, reposted below, shows the simplified main power path
Your most likely suspects are probably poor connections at the fuse link, bulkhead connector, ammeter and associated wiring, and possibly the ignition switch. In rare cases, but it does happen, the welded splice fails. This is a factory splice in the black ammeter wire under the dash. If it gets down to checking that, you must pull the cluster, untape the under-dash harness starting at the black ammeter wire and follow it down a few inches.
Start with this MAD article. Whether you bypass the ammeter or not, it points up the "thing" with these systems:
http://www.madelectrical.com/electricaltech/amp-gauges.shtml
The diagram on that page, reposted below, shows the simplified main power path
Your most likely suspects are probably poor connections at the fuse link, bulkhead connector, ammeter and associated wiring, and possibly the ignition switch. In rare cases, but it does happen, the welded splice fails. This is a factory splice in the black ammeter wire under the dash. If it gets down to checking that, you must pull the cluster, untape the under-dash harness starting at the black ammeter wire and follow it down a few inches.