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spankyjr1, Journeyman
Category: Medium and Heavy Trucks
Satisfied Customers: 2610
Experience:  I worked on all types of equipment semis,forklifts,farm,ect.
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Isuzu SBR series: I have a sbr 1977 Isuzu with a 6BB1 motor.The

Customer Question

I have a sbr 1977 Isuzu with a 6BB1 motor.
The low vacuum buzzer and light is coming on. It will flicker when travelling along. There is no difference in braking ability of vehicle It appears to be an electrical problem. Where can I obtain a wiring diagram for this vehicle? The vin/chasis no(###) ###-####
Thanks Hank
Submitted: 2 years ago.
Category: Medium and Heavy Trucks
Expert:  spankyjr1 replied 2 years ago.
Hi, my name is ***** ***** you for your question.

Sorry for long delay.

I don't have a diagram but Isuzu switches are normally open and need to be grounded to shut off light/alarm.
Try grounding the wire the electrician removed from tank sensor and see if light/buzzer goes off.
If it does you need a new switch.

Thanks in advance for leaving a positive rating. If you happen to need more help, this question will stay open for weeks.