Not to my knowledge. I've never seen a test for that. But then again I've never looked. If anything it would just activate the GPR. A volt / ohm meter would be more appropriate to test the GPR and GP's.
The 96-97 (at least the 97) Cali trucks PCM does monitor the two sides of the engine separately in regards to the GP's. Again I don't think there is any test capability.
Pete in San Ramon
2005 F250 6.0 4X4 Lariat CC short bed (stock)
1997 F250 7.3 4X4 XLT Reg. cab (stock)
1986 F250 6.9 4X4 XLT Gone but not forgotten
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That's what I figured. I think on the Cali trucks the PCM will throw a code if a glow plug draws less than 20 amps, but I'm not 100% sure. If anyone knows different please let me know. Thanks for the reply.