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Blowing a fuse in a 1995 GM truck


Sent to Car Experts May 14, 2006 8:43 p.m.
I have a 1995 GMC truck. It turns over but won't start.The fuse relay box shows that a 20 amp fuse keeps blowing;changed fuse many times.Cover box indicate's it as a ecm-b 20 amp fuse.also learned that it could be auto shut-off fuse.I want to know where to locate that also.

Optional Information:
1995 GMC K10753 4.3 liter

Already Tried:
I have tried changing the 20 amp fuse, checking the starter motor, and looking at the other fuses in the cab. So far nothing has worked. The engine cranks but it wouldn't start, as well it continues to blow the fuse.
Customer (name blocked for privacy)
Status: Closed   Value: $9   
Info Request
May 14, 2006 9:47 p.m. (1 hour and 3 minutes later) 		REPLIED to Info Request Check Mark
If fused replaced does it blow as soon as key is turned to on position?
Bill  -- mechanic -- 100% Positive Feedback on 98 Car Accepts
mechanic since 1976
Reply to Bill
Sent May 14, 2006 10:03 p.m. (16 minutes and 4 seconds later)
Yes,it does.
Customer (name blocked for privacy)
Answer
May 14, 2006 10:09 p.m. (6 minutes and 12 seconds later) 		ACCEPTED Check Mark
I believe the fuel pump circuit wich includes oil pressure switch is tied into this circuit. if you disconnect the fuel pump relay and see if fuse blows again if not your on the right track. let me know. I will check some things in the meantime, and get back to you.
Bill  -- mechanic -- 100% Positive Feedback on 98 Car Accepts
mechanic since 1976
Reply
Sent May 14, 2006 10:24 p.m. (14 minutes and 56 seconds later)
Relist: I still need help.
found the fuel pump relay and the fuse still blows when turning on the engine.

Edited by Customer (name blocked for privacy) on May 14 2006 at 11:01pm
Customer (name blocked for privacy)
Answer
May 14, 2006 11:29 p.m. (1 hour and 4 minutes later) 		ACCEPTED Check Mark
you can try unplugging both relay and oil pressure switch. If still blowing I might start suspecting a bad wire from fuse panel to engine compartment I will get back to you tomorrw I want to get a better schematic of your vehichle
Bill  -- mechanic -- 100% Positive Feedback on 98 Car Accepts
mechanic since 1976
Reply
Sent May 15, 2006 12:45 a.m. (1 hour and 15 minutes later)
Relist:
Thanks Bill,i'll hear from you tomarrow.
Customer (name blocked for privacy)
Answer
May 15, 2006 6:44 p.m. (17 hours and 59 minutes later) 		ACCEPTED Check Mark
If you have diconnected both fuel pum relay and Fuel pump/ oil pressure switch located near distributor rear of engine 3 wires tan, org, and gray going to it and fuse still blows you will need to check for a short in the orange wire to ground on both the relay and pressure switch. remove fuse firstand disconnect neg battery terminal. The orange wire is paralled back to ecm-b fuse on both devices and also to ecm.If the fuse does not blow when both are diconnected I would expect the pressure switch to be faulty. Because you already tried just the relay disconnection. let me know, Fuel pump relay has org,red,gray,drk green/white trace,and black /with white trace wires going to it .
Bill  -- mechanic -- 100% Positive Feedback on 98 Car Accepts
mechanic since 1976
Reply
Sent May 15, 2006 7:45 p.m. (1 hour and 0 minutes later)
Relist:
I disconnected both fuel relay @oil switch.The ecm-b fuse did not blow.
Customer (name blocked for privacy)
Answer
May 15, 2006 8:52 p.m. (1 hour and 7 minutes later)
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Bill  -- mechanic -- 100% Positive Feedback on 98 Car Accepts
mechanic since 1976
Info Request
May 15, 2006 8:58 p.m. (5 minutes and 18 seconds later) 		REPLIED to Info Request Check Mark
You don't need to accept anymore.
Bill  -- mechanic -- 100% Positive Feedback on 98 Car Accepts
mechanic since 1976
Reply to Bill
Sent May 15, 2006 9:51 p.m. (53 minutes and 33 seconds later)
Thanks for the info Bill.
Customer (name blocked for privacy)
Info Request
May 16, 2006 6:32 a.m. (8 hours and 40 minutes later)
Thank you and if you need more info let me know.
Bill  -- mechanic -- 100% Positive Feedback on 98 Car Accepts
mechanic since 1976

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