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blowing fuse

brian wafer

brian wafer

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our 1977 k2500 has been wired with a 1982 6.2 diesel wiring . we done the the motor swap in 1993. truck in a slow repair process. we start it to move it around the shop. last week i notice no more voltage gauge. seems like the gauge fuse blows right away. now i,m not completely sure its the (gauge) fuse because the fuse block is unreadable! anybody got a print or picture of a readable fuse block for a 1982 6.2! and maybe a wiring diagram .
 
not the same as the 1980. i suppose there,s a change in 1982. could somebody take a picture of a 1982 6.2 diesel readable fuse block! or better yet a wiring diagram!
 
Probably not much help to you,but I figured I'd try scanning my Hayne's manual wiring diagram...the fuse block photo doesn't say what year its for,but its "typical" of most 80's trucks with blade style fuses--I ended up going to a local library that had a HUGE Chilton's wiring diagram book that covered a whole table,that I could actually READ the color codes and the wires were even in color,to diagnose some wiring troubles I had on one of my trucks..

fuse block.jpg

fuse block 001.jpg
 
diesel4me do you think you could tell me, if the oil pressure gauge wire. has a splice or if its direct from sender to cluster plug. i,ve got a hard time reading diagram,its to small. my nephew got a strange problem. i,m at work, i will log in later this evening.
 
My Haynes book's wiring diagram sucks too,it's printed so small its practically worthless--the '82 diesel wiring diagram showed the oil pressure switch,but NO wires going to it!..

I'm not sure if a gas powered truck will be wired the same as a diesel or not,I dont see why not-- the diagram for an '83 gas powered truck shows a tan wire going to the OPS (says "for gauge style only" ?) and it goes to the bulkhead connector,then from there it goes to the dash wiring...if that helps at all..:dunno:..

I think if you go to Autozone's website you can download better wiring diagrams--at least they have done that for me on other vehicles at the store before..
 
thanks alot. nephew,s truck is a 1981 350 . oil pressure gauge needle goes to maximum. he replaced the sender twice ,and tried different gauges. he removed our dash assembly from our 77 with and 82 cab,and it does the same:dunno:. i thought they maybe something wrong in his wiring. thanks again!
 
I recall those years having several different senders--at least two versions for a gauge (0-60 psi,and 0-80 psi),and one for an idiot light...

It was hard getting the correct one--put the lower psi sender on the higher dash gauge or vice-versa,you'll get innacurate readings...(often customers would buy "all" the possible senders,try all 3,then return two that didn't read right,and put them in the wrong boxes!--they all looked the same,so once they were out of the box,they didn't know which one was which..(this is why most parts stores wont take electrical parts back:rolleyes:)..

If the wire gets grounded,it'll peg the needle...might want to try checking the oil pressure with a mechanical gauge,maybe the oil pump relief valve is sticking?..I have seen oil filters balloon up or pop from excess pressure a few times!..
 
he found the trouble ! but i don,t understand why it done it. there was a soft spot in wire just before oil pressure switch. he ohmn from switch to bulkhead no contact. found that soft spot in wire and repaired it,whats strange is wire isolation wasn,t broken. so it couldn,t ground:dunno:.
 
It is not uncommon for old wiring harnesses to have that issue--for some strange reason a wire will often "dissolve" in one spot somewhere,without leaving much evidence,and it sucks trying to track down that spot and repair it..

I usually just splice a new wire in and leave the bad one in the harness,and snip both ends off flush with the outer conduit..after spending a day finding out which wire went sour!..

My friend has done a lot of vehicles with wiring issues no other shops could "cure" or had the patience to track down..it is tough giving a customer a estimate,when it might take the better part of a day or longer to find bad wires,then fix it in 5 minutes with a piece of new wire and a buck's worth of solderless connectors and tape..he doesn't like taking those jobs on because they waste a lot of time,when he could be doing brakes,exhaust,or other much more profitable and easier jobs..
 
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