Leads and Accessories

Lead Wire

Alcor® manufactures lead wire for all your EGT and EHT needs.  They can be found in type J, K and extension lengths ranging from 90” to 240”.  For futher information please see our Installation Manual under the Literature tab. To purchase please see our distributor page or visit our e-commerce section of the website.

Q: What do I do when the probe terminal stagger does not match the stagger of the lead?
A: Pull wires together keeping color codes matched or use stagger adapter, P/N 42523 available from Alcor®.

Q: Can I splice an extension to the lead?
A: Yes, providing you use the same kind of thermocouple wire the connections are not located at a bulkhead. If connection is at bulkhead, then ends of lead connection will be different temperatures (engine compartment vs. cabin) and that temperature differential will show on meter. This can also be caused when a mismatched lead type is used with meter and probe. Standard terminals or crimp connections can be used if connection is not at a bulkhead.

Q: Why does the meter read full scale?
A: The problem may be one of the following:

  1. Meter out of calibration.
  2. Type E probe in a Type K system.
  3. Lead is routed near high current bus or cables and is receiving stray EMF induction. To verify problem #3, turn off master/alternator switch while engine is running to see if needle drops. If it does, then trace entire lead from meter to probe to isolate wire. If it does not, then suspect problem #1 or #2.

Lead Installation Instructions

Accessories

Alcor® manufactures a variety of accessories for their world leading EGT, CHT and TIT probes.  These include but are not limited to JPI®/EI® probe adapter, CHT bayonet adapter, lead stagger adapter and copper gaskets.  For information on these items and other accessories please contact our distributor network or our e-commerce page.

Q: What do I do when the probe terminal stagger does not match the stagger of the lead?
A: Pull wires together keeping color codes matched or use stagger adapter, P/N 42523.

Q: Can I splice an extension to the lead?
A: Yes, providing you use the same kind of thermocouple wire, and the connections are not located at the bulkhead.  If connection is at the bulkhead, then ends of lead connection will be different temperatures (engine compartment vs. cabin) and that temperature differential will show on meter.  This can also be caused when a mismatched lead type is used with meter and probe.  Standard terminals or crimp connections can be used if connection is not at a bulkhead.

Q: Why does the meter read full scale?
A: The problem may be one of the following:

  1. Meter out of calibration.
  2. Type E probe in a Type K system.
  3. Lead is routed near high current carrying bus or cables and is receiving stray EMF induction. To verify problem #3, turn off master/alternator switch while engine is running to see if needle drops.  If needle drops, then trace entire lead from meter to probe to isolate wire.  If the needle doesn’t drop, then suspect problem is #1 or #2.