Big Electrical problem
#1
Big Electrical problem
I am working on a 85 k5 6.2l diesel blazer. Someone "helped" me jump start the truck but reversed the the cables. Since then the truck has not started. The dashlights do not come on, so far I have checked the alternator and starter both passed. Headlights came on when I jumper from battery to junction block on the firewall otherwise all is dead. Not sure what to check next. Any help would be appreciated.
#3
Is there an inline fuse between the fuse box and power source... not sure if it runs to alt or battery. If so, and that is blown, you will get no power to the fuse box. Also, where did you jump to on the fuse box? Main power in? If so all the fuse box should be fine, replace the cable or inline fuse in the supply wiring.
#4
There is no main fuse(that I know of) and I didn't jumper to the fuse block; I jumpered to the a junction block. After doing some investigating I noticed no wire from battery to the alternator and also a fusible link that was missing by the junction block. Now I have lights and accessories but turn the key and nothing.
#7
This is probably going to sound obvious, but check every wire and ground under the hood. Also check the fusible link(s). Similar situation happened on my 90 K5 Blazer and the results were, fried PCM, fried alternator, fried battery cables and a melted fusible link.
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