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Can you supply me with the actual model number?
You are correct. Your unit does not have a hot surface but a spark. Follow the spark cable from the ignitor box to the pilot.
The ignition box gets 24v and then starts sparking at the pilot while the gas valve emite pilot gas.
Which part would need to most likely be replaced if I have an ignition problem?
That is hard to tell. Kind of like "my car wont start, what do I need"?
This could be the ignition box...
the ignition box is not getting power...
a safety is engaged...
If you have a meter to track voltage?
To proceed according to part failure put the ignition box first. The pilot assembly is rarely the cause for nonspark conditions.
I see they used 2 different modules....can you tell me any info from the box the orange cable attaches to?
I might be answering my own question here - not sure if this is actually the ignition box:
Type 5059-41 Pilot Relite
Pri. 25V 60Hz .030 Amps
Trane CAC Pt No. A309149P02
Would still need it because of cross refencing for replacement parts.
See here - http://www.partsguy.com/cgi-bin/PartsGuy/L38127.html
It is the replacement for your part. Read the parts it replaces and you will see your
5058-41 in the list.