Re: No Electrical power battteries 100%???
Tarm what yr truck are you working with?
Is your glow plug controller (GPC) a round one that is mounted on coolant passage plate at driver's rear cyl head w/ a separate relay?
If it is you need to upgrade to the later solid state relay assy.
Also know that those glow plug harnesses are made from fusible links.
When you get to glow plug testing I can help you with a diagram & diagnostics.
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