10.18 10.18 Electrical Electrical systemsystem
AATTLLEET T SSEERRVVIICCE E MMAANNUUAALL IInnssuullaattiioon n rreessiissttaannccee
1100..66 IInnssuullaattiioon rn reessiissttaannccee
0
0
1100..66..11 RRoouuttiinne te teesstt
YYou must first disconnect tou must first disconnect the connections (plugs) before the truck is he connections (plugs) before the truck is insulationinsulation
tested in order to protect the regulators and other electrical components on the truck.tested in order to protect the regulators and other electrical components on the truck.
This is because damage may occur that will shorten the life of component parts. InThis is because damage may occur that will shorten the life of component parts. In
the event of large insulation errors it is appropriate to use a the event of large insulation errors it is appropriate to use a universal instrumentuniversal instrument
until the error has been found and then make a funtil the error has been found and then make a final insulation test.inal insulation test.
This applies to all electronic units in the This applies to all electronic units in the truck.truck.
The instrument has a The instrument has a dangerous voltage across the measurement terminals. Do notdangerous voltage across the measurement terminals. Do not
touch the terminals during touch the terminals during testing.testing.
Routines for insulation testing of all truck models.Routines for insulation testing of all truck models.
1.1. Set thSet the tese test volt voltagtage to 10e to 100 vol0 volts fots for the inr the insusulatlation mion measeasureuremenment inst instrutrumenment.t.
2.2. PulPull out the bl out the battattery plery plug. Diug. Discosconnennect conct connenectictionsons/te/terminrminals to eals to electlectricricalal
components and electronic systems before the test is components and electronic systems before the test is performed as these canperformed as these can
be damaged by the test be damaged by the test voltage.voltage.
3.3. ConConnecnect the int the instrstrumeument'nt's ears earth leth lead to tad to the trhe truck cuck chashassis asis at a poit a point wint with goth goodod
electrical contact. The other lead is electrical contact. The other lead is connected to the electrical panel connected to the electrical panel plug'splug's
positive terminal.positive terminal.
4.4. PrePress thss the stae start butrt button aton and wand wait unit until thtil the dise displaplay has sy has stabtabilisiliseded, now re, now relealeasese
the button and read off the button and read off the value on the display. An approved value of 48the value on the display. An approved value of 48
vovoltlts os on tn truruckcks ss shohoululd be d be at at leleasast 4t 480800000 , (4, (48 k8 k ).).
5.5. Let Let the ethe earth arth lead lead remairemain atn attachtached ed to thto the che chassis assis and and connconnect ect the othe other ther lead lead toto
the electrical panel plug's negative terminal. After this repeat point 4.the electrical panel plug's negative terminal. After this repeat point 4.
Ω Ω ΩΩ
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