for testing purposes, here what Ive done

on the sending unit connector

Blk, Purple, grey


on the firewall connector

Blk, pink, brown
on the sender side...I connector a meter to:

Blk/Purple= about 19-20ohms ( I believe my tank is a lil less than 1/4 full)


on the firewall connector side I connected to:

continuity(ohms)
black to ground strap= positive
pink to ground= OL
brown to ground=OL

black to pink=positive
black to brown=OL
pink to brown=OL


with ignition on

firewall connector:

black to pink=8.5 vdc


I think this may be my problem....hope this makes sense. I just completed a swap and everything work and runs well, but now I get my fuel gauge being erratic. and now it pegged to full.

what can I do to test both sender and gauge, I think Ive tested send with the ohms reading, but whats scratching my head is the 8.5V going to the sending unit...shouldn't it be 12Vdc?

I also read about ground the connector on the firewall and needle should read empty...any help

Thanks

quote Originally posted by knarfluna: ....hope this makes sense. Thanks

It does not to me, but if you see the fuel gauge pegged full, you have infinite resistance...a break in the circuit somewhere.