TM 5-5420-226-20-1 Symptom-73 DETAILED TROUBLESHOOTING PROCEDURE T SUPPORT SYSTEM -   PERSONNEL HEATER (Continued) ~  Check for   electrical power at   personnel heater fuel pump    (CKT    402). First l l l Technician (Personnel Heater) Disconnect harness connector in   personnel heater fuel   pump power lead. Set   multimeter to   measure 18  to    30voltsdc, or   use STE/ICE Test No. 89   (page 4-81). Connect red    probe of   meter to   harness connector (CKT 402)    and    black probe to   ground. Second Technician (Operator’s Station) l   Set    HEATER MASTER switch ON. l   Set   PERSONNEL HEATER HVLO First Technician (Personnel Heater) switch ON-LO l   Check    if   meter    indicates 18  to   30   volts dc. Does    meter indicate 18  to   30   volts    dc? Set   PERSONNEL HEATER H1/ LO   switch OFF. Replace personnel heater fuel pump    (page 18-24). Connect fuel line quick disconnect at personnel heater. ESS CTOR 402) P PUMP ( cJo- YES NO I I CKT ) l   Set   PERSONNEL HEATER H1/ LO  switch OFF. l   Inspect heater to basket disconnect harness for    bent/ broken connector contact or loose    CKT   402   wire    at   rear   of connector. l   Repair connector if   defective (page 10-298). l   If  connector is  not   defective, notify support maintenance of defective heater to   basket disconnect harness. l   Connect    CKT   402  connector at fuel   pump. l   Connect fuel line quick disconnect at personnel heater. TA107383 4-694